An undated interview with Ike Eisenmann (the kid on the left, pictured with his FANTASTIC JOURNEY co-stars), who worked with Shatner as a kid actor in STAR TREK II and T.J. HOOKER. Ike appeared in a number of movies and TV shows, including the short lived show FANTASTIC JOURNEY. Title sequence from the 1977 show here. A clip from an episode here.
Lots more on the 10-episode series, which a number of original TREK people worked on, here.