a request for suggestions

this play that i'm assistant directing is starting rehearsals soon, and i've been meeting with the director. and one of the things that i thought of during our discussion was the sci-fi trope of people being taken to a place where they are essentially forced to perform roles for the entertainment of those who took them. i'm thinking of a kind of human-as-puppet thing here, whether for entertainment, for education, or just for the hell of it. the one specific example i could come up with was that episode of farscape where crighton and crais were kidnapped by that wizard and manipulated to fight (and to a lesser extent crighton's trip through the faux-wormhole), but i think there were a couple of episodes of star trek with this theme--maybe with q in the next generation, and i have some image of some of the original series cast trapped in a room with people in sort of commedia dell'arte costumes? can anyone give me more concrete suggestions for actual episodes? from any show.