The Captains features Shatner in conversation with the likes of Patrick Stewart, Scott Bakula and Chris Pine, and he admits it was a very rewarding experience.
Shatner says, "The documentary that I directed and am in... is a voyage of a kind, an epiphany for me within the documentary.
"We flew all over the world to find the actors who were the Captains in Star Trek and I found traits and abilities and tendencies that were communal, that we all had. All the actors had many things in common.
"Everybody got divorced, everybody had trials and tribulations, everybody had a sadness."
As part of the documentary, Shatner arm wrestles Pine.
The show debuts on U.S. cable channel EPIX on Friday (22Jul11). Shatner will also host a screening of the film at the Hollywood Forever Cemetery on Monday night (25Jul11).