even i can't tell. >> reporter: that's the ultimate measure of success for robert barron, the man whodesigned eric's prosthetic. it's something he's used to because barron's designs are fit for spies, literally. in his previous life, barron was an undercover agent creating disguises for the c.i.a. >> i tinted silicone to look like skin. that was my forte. >> reporter: for 15 years, he crafted silicone masks for operatives working incognito around the world. >> agents depended upon the realism of that disguise because if that disguise attracted attention in a negative way, then their lives were in jeopardy. >> reporter: it's the stuff movies are made of. >> that's right. yeah. >> reporter: but in 1983, he went under cover to a biomedical sculptor's conference to learn some new tricks of the trade. it was a mission that changed his life. >> i saw the disfigurements of people without a nose, without eyes, without ears. i said, "bob, if you can put people in hiding, you can bring these people out of hiding." >> reporter: nine years later, he retired and today works out of his ashburn, vir