The story of MGS's loss of contact has to be one of the saddest things ever D':
Basically NASA sent it a command, they fricked up the command, it turned the orbiter so it was right in the sunlight and the battery overheated, it sent one last message basically saying "hi, I'm in danger and waiting for instructions, what's going on" and then DIED-
And you were having a good day until now, weren't you?

Planned skins: all orbiters, Beagle 2 (maybe), and the ground test rovers (Marie, Dusty, Maggie, etc.) if I have time