i've been work work work work this is "nightline." tonight, magic pill, took her from this to this. fans say this may change the way we diet. so, why do you have to go to mexico to get it? plus, star power. the biggest "x men" movie yet with a host of hollywood a-listers and two nights of the realm. including sir patrick stewart. tonight telling us about a career that's taken him from broadway to the starship enterprise. >> quite compelling. >> and now a new viral phenomenon involving this.

>> i'm pregnant. if it might be yours. ha-ha-ha. ♪ let me see you move >> and love never felt so good. justin timberlake debuting his latest music video. starring none other than michael jackson. the new duet that's got everybody talking and dancing tonight. ♪ ♪ felt so good ♪ >> but first, the "nightline" 5. >> people all over the world know us but they don't yet know we are a family. we are right where you need us. at the next job, next adventure, or at the next exit. helping you explore super destinations and do everything under the sun. 12 brand. more hotels than anyone else in the world. so wherever you want to be. ♪ ♪

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good evening. it is a tantalizing notion for a weight obsessed america. what if there was one pill that would radically suppress your appetite and help you shed pounds? sounds like a classic too good to be true scenario. fans of this new pill called the magic bullet say it is real and it works. if you want it though you are going to have to go abroad. so we sent the chief investigative correspondent to mexico. >> nice to meet you. >> hi, kim, how are you? >> at 330 pounds, 4-year-old kimmy g. says she is never full. >> but i did eat one before that. we are not going to talk about that. >> reporter: she has tried every

diet, every weight loss regime. still nothing seems to work. and in another sunny suburb of los angeles, we met dr. daisy martin. >> i gained 10 pounds after getting married. i gained 20 pounds after having a baby. so i feel like i have 30 pounds that have just, has not moved since i was in my 20s. >> reporter: both women recently heard of a new capsule, a magic bullet, to help in their fight to lose weight. one that claims the kind of results that so far only invasive surgery has produced. and it is not just for the severely overweight. >> are you nervous? >> i think i am excited. >> you are. >> i am excited i don't want the gastric bypass or lap band. i am heavy. >> reporter: why not? >> cutting your stomach is not really the issue. the issue is right here. that's the main issue. just kind of a jump-start. >> reporter: or in kimmy's case, a restart. >> this is when i won. >> a few years ago she was a

successful plus-sized model even appearing in the movie. her goal is to lose about 60 pounds, nothing more. >> reporter: you would look to go back to modeling. >> yes, it would be great. i still was heavy. i was thick. i felt better. i can move around better and wear good clothes. >> reporter: that's what your plan is then? >> that's my plan. >> reporter: but the plan isn't that simple. >> why is it making you nervous? >> jumping the border. going over there. this is exciting. i've mean, i'm going to a dif rn ferent country to get the procedure. >> you haven't been able to eat for 12 hours. >> it is worth it. >> reporter: the capsule isn't available yet in the u.s. so patients like kimmy and daisy must drive across the mexican border to tijuana, mexico. a bustling city with a rap for violence and crime. >> this is it. this is the border.

are you serious? >> yeah. >> reporter: every year thousand of americans cautiously flock there in search of cut rate medical care. the capsule is a controversial device called obolong. once it enters the stomach it is inflated into a small balloon. patients feel full immediately. >> here you go. >> we finally arrive at obesity control center in tijuana where kimmy meets a new friend. >> is it painful? >> no. >> reporter: gloria is a tijuana native and took the pill three months ago and has lost 25 pounds. both women are here to meet this man. dr. ortiz, a mexican surgeon who was born and raised in tijuana. >> the morning starts early. >> reporter: obolong patients helped research the capsule. >> ask me what is the benefit of working in mexico -- i get to decide the quality of health care i provide to my patients.

>> reporter: he lives in san diego, every day he heads to his clinic in tijuana where 70% of his patients are american. his staff fields more than 100 phone calls a day from patients wanting to know more about the balloon pill. >> buenos dias. how is everybody doing? >> reporter: most are american as well. >> we're going into the operating room. >> reporter: they come to him not only for the capsule but for other treatments that are approved in the u.s. but cheaper here in mexico. patients like kimmy will save thousand of dollars by getting the balloon which goes for $4,000, a fraction of what a gastric bypass surgery goes for. >> it is very intrusive. >> i wouldn't want to go through this. >> i agree. i believe one day, what we are doing now is going to be seen as barbaric. >> reporter: there is another crucial difference. >> daisy. >> reporter: unlike gastric by pass, the bill isn't just for the morbidly obese.

>> this is a device. the capsule. >> reporter: the pill comes with its own set of strict guidelines. >> this is exactly the size of-- the balloon that you are going to have. patients won't be able to eat solid foods for the first three days. and for 12 weeks they have to commit to working out 90 minutes a day. >> you are going to be losing weight. you are going to be losing fast. >> reporter: once daisy starts to eat food she won't be able to eat more than a small plate of food a day. the capsule is so new there is no consensus yet in the american medical community about it. but plenty of intrigue. >> i would have to say, sounds interesting, i want to know more. see bariatric surgy is effective and should be a last resort. >> he teaches weight management. he says sustaining weight loss after the pill comes out is a concern. >> the stomach is a hormone

producing organ. and surgery influences the hormone, that's part of the effect of the surgery. does the balloon do that, rival the effects of surgery. what happens when the balloon goes away. effects of the surgery for the most part are permanent. if you have a balloon put in your stomach to make you eat less and you lose weight, are you then dependent on that balloon for the rest of your life? >> back in mexico we check in with daisy and kimmy as they get ready to swallow the capsule. both on different end of the weight loss spectrum. one who need gastric by pass. and the other who could easily lose 30 pounds with diet and exercise. >> don't force the swal low. it has to go down nice and easy. >> reporter: it is harder than it looks. >> it's weird. >> she tries again. >> if the won't through.

perfect. wait a little bit. >> reporter: now it is kimmy's turn. there you see the bubble inflating in kimmy's stomach. >> see the half moon right there. and kimmy was well, pretty happy. the pill is suppose to be removed after three months. remember, gloria, she has had the balloon in her stomach for four months already. so the doctor might want to remove the balloon, you want to keep it. >> i want to keep it. maybe one more month. >> reporter: gloria gets good news. we wanted to remove the ba lall today. we are going to give you more time. >> reporter: if the balloon wasn't there, ooh, lord i would have ate. daisy and kimmy kept video diaries to let us in on the progress. >> end of week two, beginning of week three. i lost a total of 14.whatever pounds. >> i have lost five pound so

far. >> reporter: after 30 days, daisy has lost almost ten pounds. >> usually. probably like this much. set my stomach. and kind of keep me going. >> reporter: and kimmy, a whopping 22 pounds. >> i went through easter. not going to lie, that ham was damn good, okay. i did sneak some pieces. >> reporter: when the balloons come out in two months we will be there to see if they're able to keep the weight off. for "nightline," in tijuana, mexico. next here on "nightline," the biggest x men movie yet, features a who's who of hollywood including one star who has taken us behind the scenes of this summer blockbuster. as early as 1 to 2 weeks. i wish i'd talked to my doctor sooner. [ female announcer ] abilify is not for everyone. call your doctor if your depression worsens or you have unusual changes in behavior, or thoughts of suicide. antidepressants can increase these

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the summer blockbuster season is upon us. one of the most star-studded films comes out this weekend. the latest installment of the x men series. tonight one of the stars, one of two of british knights in the cast shares an inside look with my "nightline" co-anchor juju chang for our series "on the town." >> i had a glimpse into the past. >> despite all the high priced special effects. and the skin tight leave nothing to the imagination costumes, the most striking x factor of the x men may be the caliber of the acting. imagine a sci-fi movie chockful

of oscar winners and several nominees. >> you really think this will work? >> i have faith in him. >> reporter: that's not all, two knights, sir ian mckillen and sir patrick stewart, plays the leader of the x men, new superheroes who come together in the fifth installment of the franchise, "days of future past." >> we need you to hope again. do you worry audiences will grow tired of combic book movies? >> what is distinct to "x men" is they always had a philosophical moral content. so that has been at the heart of the whole franchise. >> reporter: we sat down recent leap ly at the restaurant in new york city. city he calls home. you are a british sir and brooklyn hipster. how do you reconcile the two side of you? >> i don't think they need reconciling. i was never a big city person. i always felt intimidated and

out of place. i grew up in quite a small town. now, that i should claim that brooklyn is a small town. >> it's the way of doing it if you want to go on living! >> reporter: it is brooklyn's proximity to broadway that often keeps the veteran stage actor busy. collaborating recent leap wily mckiellen, for two classics. >> why do you come here? >> reporter: the two have known each other for decades. yet it took the blockbuster "x men" movies to seal their friendship. >> i will always be there. old friend. >> one aspect of movies like these are that -- you spend a lot of time waiting. >> in the trailer. >> yeah, our trailers were, very, very comfortable.

>> they grew so close that when he married his long time love, sunny ozell, sir ian actually officiated. >> it was my wife's idea. ian became a member of the universal life church online. >> i love it. >> i recommend it. >> at 73, his third marriage has brought a fresh step to the man most of us got to know, of "star trek the next generation." as a huge fan, "star trek" could have been a career killer. what made you say yes, initially? haw m >> i didn't. i firmly said no. but his agent managed to talk him night. which paid off. a smash hit turned cultural phenomenon. >> engage! >> i remember, our producer sag to me, the day that -- that our pilot episode aired more people will see you act tonight than have seen you act in your entire career in total.

>> reporter: both gratifying and horrifying at the same time? >> exactly. >> sharing thoughts and feelings is -- is quite compelling. >> reporter: what was your reaction to being, if i may say, a sex symbol? overnight? >> bemusement. a longing that, that, might have happened to me 35 years earlier. >> reporter: after headlining two iconic sci-fi franchises he maintains his gravatas and picks labors of love like "match." >> you are a man who should be concentrating on satisfying his beautiful life. >> reporter: comedy is an acting muscle stewart is exercising more these days, a voice on "american dad." >> you slept with my daughter? >> well, to be perfectly honest, neither of us did very much sleeping. rip he often takes to twitter to entertain his million-plus

followers. your you're releasing your inner comic. laurence olivier said it is marvelous to hear people sob or gasp at your performances. but the satisfaction of hearing them laugh is so much greater. >> reporter: he got a lot of laughs with a youtube clip that went viral, perfecting the art of the double take. >> her buns are the best. >> reporter: and he showed me how it is done. so i have to say something that you will be surprised at, right. so, i'm pregnant. it might be yours. that was good. want to see the triple. >> so i'm pregnant. if the might be yours. ha-ha-ha. for "nightline," juju chang, making it so in new york city. >> big thank you to juju there." "x men days of future past" opens in theaters may 23rd.

coming up on "nightline." it is called love never felt so good. justin timberlake's new collaboration with michael jackson. ♪ love never felt so good 20 million men already have. ask your doctor if your heart is healthy enough for sex. do not take viagra if you take nitrates for chest pain; it may cause an unsafe drop in blood pressure. side effects include headache, flushing, upset stomach, and abnormal vision. to avoid long-term injury, seek immediate medical help for an erection lasting more than four hours. stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. this is the age of taking action. viagra. talk to your doctor. feel like a knot. how can i ease this pain?

(man) when i can't go, it's like bricks piling up. i wish i could find some relief. (announcer) ask your doctor about linzess-- a once-daily capsule for adults with ibs with constipation or chronic idiopathic constipation. linzess is thought to help calm pain-sensing nerves and accelerate bowel movements. it helps you proactively manage your symptoms. do not give linzess to children under 6, and it should not be given to children 6 to 17. it may harm them. don't take linzess if you have a bowel blockage. get immediate help if you develop unusual or severe stomach pain especially with bloody or black stools the most common side effect is diarrhea, sometimes severe. if it's severe, stop taking linzess and call your doctor right away. other side effects include gas, stomach-area pain and swelling. bottom line, ask your doctor about linzess today.

"nightline" continues with feed frenzy. >> this year's sound of the summer coming to us from beyond the grave? michael jackson is paired with the very much alive justin timberlake in "love never felt so good." ♪ love never felt so good >> featuring never heard before recordings and brand new music video that pays homage to certain other hits from "bad" to "beat it." he said that any artist would kill for the chance to record a song with the king of pop. and now, his dream is a reality. and its first day on line the video wracked up millions of hits. good news for fans, there is more to come. the video going viral tonight. finally tonight we want to tip our collective hat to the

irrepressible, irreplaceable barbara walters, retiring this week after more than 50 years on the air. she has filed many memorable pieces for our show during that time. look at this picture, barbara surrounded by all the female anchor whose followed in her weak. you c -- wake. you can see more tomorrow on "the view." and here tonight we fake a look back at signature barbara walters' moment. >> when i do an interview, i want a strong beginning and a strong ending. in order to get the strong ending i often ask, finish this sentence for me. finish this sentence for me -- will farrell is -- >> funny but -- but honest and devilishly handsome. >> that will dio it. >> usher is -- >> here. >> ann hathaway is -- for frz.

>> very, very, over the moon happy. >> mariah cary is -- >> a nice girl. >> donald trump is -- >> a good person. >> chris christie is -- >> a leader. >> kanye west is -- >> black. that's the first thing that popped in my mind. >> finish this sentence for me -- >> bill gates is -- >> i think that is an oversimplification for anybody to say, somebody is just one

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