The legendary Star Trek actor recalls his fear of being on stage with "no lines."

Is a documentary about William Shatner his real-life final frontier? The Star Trek legend has participated in a new film about his life and career, directed by Alexandre O. Philippe (Doc of the Dead, The People vs. George Lucas), and he stopped by EW's Comic-Con studio Thursday to tell us all about it.

"I was two days in front of a camera for many hours each day," Shatner said. "So talked a great deal about a subject I know a little about: That's me! And did the best I could, and Alexandre has been doing months of research and piecing it together, and everybody's quite happy with what they've seen."

Why did Shatner think this was the appropriate time to collaborate on such a project? "I've gotten older, I don't know if you know about that," said the actor, 91. "So the older I get, the more I think maybe I should record some thoughts."