I don't get the Richard O'Brien reference though
I've edited above, but Richard O'Brien hosted a game show in the early 90's on TV called "The Crystal Maze", i.e. the same name as the mission. Thought that was a dead giveaway, then somewhat depressingly I realised anyone under the age of 20 won't have be born when it was on air - it feels like yesterday to me
Back on topic, my guess The Big Score: Obvious Approach.
You're old, man. Old and wrong.