... A different one, actually, but same species as Zim. Her name was Tak. Her ship got left behind after she was chased off the Earth by Zim.

[Granted, Dib had ended up helping Zim do that because Tak's plans involved destroying Earth, but he refrains from mentioning this.]

I was able to reprogram it so that I could use it for myself and chase after Zim any time he tried to do more of his evil schemes from wherever he decided to go to, including even going to the moon once.