S1, E37: Ben's vacation to Portland is cut short when he discovers an 11th alien while battling a Dr. Animo Mega-Creature. But when the fight leaves his Omnitrix on the fritz cycling through all 11 aliens, Max seeks help from an old friend to fix the Omnitrix as other dangerous forces seek it including a mysterious alien that's the same species as the 11th alien, Vilgax!