This was one of the best cars I've owned and I kinda miss it.
Long story short, a friend of my dad's got given it as payment for something, did nothing with it, and finding out we were “Land Rover types” asked if we knew anyone who wanted “a free Land Rover”.
Why Gir?
GIR is the insane, hyperactive robotic assistant of Zim and the closest thing the incompetent Irken has to a friend, having been constructed from scrap parts and given to Zim by the Almighty Tallest just before it was handed to Zim.