In the episode "Megadoomer", Tenn was supposed to receive a Megadoomer Combat Stealth Mech as a gift from her leaders, but - thanks to a rebellious worker on the Conveyor Belt Planet switching the labels - instead received a package of deadly malfunctioning SIR Units, which were meant for Zim; as a result, Zim ended up receiving the Megadoomer, while Tenn got the psychotic robots, which promptly began to destroy her base. It is also unknown how the planet Meekrob looks like from space, though the terrain appears to be rocky and barren.