In case you're not familiar, it was a classic TOS episode that had Captain Kirk fight for the amusement of these brains-in-a-jar gladiator overlords.
Look at this fight.. Who enters an arena armed with a whip? Lol.. I loved this stuff as a kid.
Anyways, I did a Triskellion arena and had my mirror-Universe evil Starfleet gladiator fight interdimensional abducted aliens.. everything from Wookies to Fantasy elves.. I made a list and rolled randomly to see who he would be pitted against.
My one and only fight was with a Star Wars stormtrooper.. so I took a stormtrooper mini and did a conversion by adding a shield and spear and they fought it out.
I'll have to do another arena again as I threw out the other one, but it shouldn't be a problem.