. >> if you don't know who i am, just pretend i'm donny osmond. you'll be fine. but you probably recognize his comedy, in particular, "family guy," macfarlane created 15 years ago. where he voices most of the characters. his first feature film, "ted," has raked in $500 million worldwide. >> that's my bad. >> reporter: earning macfarlane an oscar nomination for best original song. forbes listing him as the 74th most powerful actor in the world last year. >> i think he's going to hit it out of the park. he is a big-time envelope pusher. and he may very well offend a few people that night. i'm personally looking for to that. >> reporter: this is a performance macfarlane has spent five months perfecting. but the only thing he'll reveal is he'll deliver what he thinks is funny. >> once you get through the opening, unless you do something really stupid, you're pretty much gold. >> reporter: macfarlane did meet with billy crystal for advice. but his favorite oscar host of all was johnny carson. brandi hitt, abc news, los angeles. >> hard to beat crystal, carson and bob