1st session start ideas, end of a battle?

[dascarletm]

Something like that absolutely requires the players buying in before the game starts, even before characters are created really.

IMO it's not something you can just dump on the players without their agreement. NEVER start a campaign with the PCs captured, imprisoned, mind-controlled, enslaved, or otherwise stripped of control unless the players agree to it beforehand.

I think that depends on the level of trust between DM and players.

Would I spring this on a group I just picked up at the local gaming store? No.
Would I spring this on the group of close friends I've been playing with for 15 odd years? Sure.