There's retiring old video game characters by not using them any more, and then there's retiring old video game characters by building little models of them and destroying them.
Introversion, the developers of strategy game Darwinia, are done with the property. Having worked on it in some for another for nearly a decade now across its various forms, by 2010 they'd become so sick of the thing that they couldn't just let it go quietly into the night. They had to kill it. With fire.