Megas of Mars (Megas XLR/Gundam IBO)

Synopsis: "Several weeks after the events of The Dimensional War against his evil counterpart, Coop decided to give his friends Jamie and Kiva their mechs and go for a test run to Mars. Just like his old one, his new Megas had a dimensional portal which the trio ends up in another dimension where they see that Mars is colonized before finding themselves caught in the middle of conflict."