The alliance between the Transformers leaders ends. Hotshot and the other Transformers attack Unicron once more. Optimus Prime and Galvatron fight to the death
A personality-modifying virus is planted on Optimus Primal by Scorponok, which turns him into a cowardly, submissive weakling. As a result, the virus malfunctions, and Primal becomes furious.
S1E10 21 min