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Beast Machines: Transformers

Season 1, Episode 4· Mercenary Pursuits

Rattrap discovers a countervirus that helps him transform -- but once he starts, he can't stop.

Episodes

1The Reformatting 2Master of the House 3Fires of the Past 4Mercenary Pursuits 5Forbidden Fruit 6The Weak Component 7Revelations: Discovery (1) 8Revelations: Descent (2) 9Revelations: Apocalypse (3) 10Survivor 11The Key 12The Catalyst 13End of the Line