Ben 10: Alien Force
15-year-old Ben Tennyson chooses to once again put on the Omnitrix and discovers that it has recalibrated and can now transform him into 10 brand-new aliens. Joined by his super-powered cousin Gwen Tennyson and his equally powerful former enemy Kevin Levin, Ben is on a mission to find his missing Grandpa Max.

Season 2 · Episode 12 ·
War of the Worlds (1)
Ben, Gwen and Kevin gather their allies to counter the threat of the incoming Highbreed fleet. Azmuth reveals a secret about the Omnitrix.
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Episode 12 of season 2 of Ben 10: Alien Force: “War of the Worlds (1)”. Aired 2009-03-27. Watch it online free on ZapFlix.