Bobby Clark was a stuntman and actor who wore the Gorn costume for much of Arena and played several other small parts in The Original Series.
Bobby Clark was a stunt performer who worked on The Original Series in its first and second seasons. He is best remembered as the Gorn captain in Arena, wearing the reptilian suit for the location filming at Vasquez Rocks; Gary Combs shared the role and Ted Cassidy provided the voice.
Clark can be seen without a mask elsewhere in the series. In Mirror, Mirror he is one of the henchmen who back the alternate Chekov's attempt to assassinate Kirk outside the turbolift, and he performed uncredited stunt work in other episodes.
In later years he became a regular guest at conventions, where he spoke about the discomfort of fighting in the Gorn costume in desert heat.