Television loves superheroes, starting with Superman in the '50s; Batman and The Green Hornet (with Bruce Lee) in the '60s; Wonder Woman and The Incredible Hulk in the '70s, and Greatest American Hero in the '80s.

The fascinating back stories of "Star Trek," "Lost in Space," and "Twilight Zone" are told and packed with fresh insights on the stars who made these series such a long-term success.

The four formative sitcoms that shaped the TV landscape: "I Love Lucy," "The Honeymooners," "The Andy Griffith Show," and "The Dick Van Dyke Show."

Following the legacy of the sitcom stars who followed, including Mary Tyler Moore, Betty White, and Marla Gibbs.

This star-packed episode features fresh interviews with Jerry Seinfeld, Roseanne Barr, Tim Allen, Ray Romano, and Bob Newhart; revealing how America's top stand-up comics made the transition to the sitcom form.

"Gunsmoke," "Bonanza," "The Rifleman," "Wild Wild West," "Maverick," "Big Valley," and "Daniel Boone" are among the iconic series profiled in this episode.