Star Trek: The Original Series
Arena
S1 E18:
To settle a skirmish between the Enterprise and a Gorn ship, a powerful race calling itself the Metrons force Kirk and the Gorn captain to fight to the death on a empty world, using only their wits and natural materials. The captain eventually finds empathy with the Gorn, surprising not only him but the Metrons as well.
Starring
Jerry Ayres, Grant Woods, Tom Troupe