Olympus Mons is a shield volcano (a domed volcano with sloping sides) on Mars that holds the title of "tallest mountain in the galaxy" and is the second biggest mountain overall.[1] Olympus Mons is the setting for Mars' defense system, M.A.R.G.L.E.S., who stands at the top awaiting the return of GOLB, whom had attacked it many years prior.
Olympus Mons was first mentioned by King of Mars in the episode "Sons of Mars" when asking Jake (who he believed to be Magic Man) what happened on the day that he and M.A.R.G.L.E.S. went to the top of Olympus Mons, implying that this was the day that he went crazy. Olympus Mons was again mentioned and pictured in a flashback in the episode "You Forgot Your Floaties".