[2] Three young Earth people were selected many centuries ago and teleported to another planet, where they were given eternal youth and superpowers.

They were trained and returned to Earth, where they are tasked with protecting the planet and its vicinity, similar to the Green Lantern Corps.

Additional, uncredited actors including Alan Oppenheimer and Ted Cassidy provided voices for guest characters.

Like many Saturday morning children's shows in the 1970s, the scripts emphasized morals including tolerance, understanding, environmental awareness, friendship and teamwork, so many of the opponents were simply misguided or misunderstood rather than actual malevolent villains.

[3] In addition, extras include scripts and Spanish language tracks for all 13 episodes, audition tapes, a gallery featuring original images, early presentation images, trivia and interviews with creators Lou Scheimer, Buzz Dixon, Darrell McNeil, J. Michael Reaves, Robert Kline and David Wise.