crossoverfic | Challenge

Over on my LJ, I've been releasing some of my Plot Bunnies to the wild, and I just realized that since quite a few of them are crossovers, I could issue them as challenges here. So I hereby challenge ye to complete one or any of the crossover bunnies given in the following LJ entries:

Plot Bunnies part 1 (Doctor Who/Sentinel), (Mission Impossible/Highlander), (Sentinel/Providence)
Plot Bunnies part 2 (Highlander/Champions)
Plot Bunnies part 3 (Sentinel/Crossworlds/Blind Fury), (Sentinel/Sliders), (Sentinel/Champions), (Sentinel/Unbreakable)
Plot Bunnies part 4 (Tomorrow People/Champions)

The Bunnies vary in size, some just being vague ideas, others having grown to the size of multiple scenes. But I would like to see these ideas completed, I've just given up on being able to do them myself.