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 3 · Episode 20 ·
The Final Battle (2)
Powerless, Ben goes aboard Vilgax's ship and faces off with Vilgax to stop his invasion of Earth in their final battle. Albedo gives Ben the Ultimatrix and Ben gets his old aliens and their evolved forms.
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Episode 20 of season 3 of Ben 10: Alien Force: “The Final Battle (2)”. Aired 2010-03-26. Watch it online free on ZapFlix.