Transformers: Prime
Roll out with Optimus Prime, Bumblebee, Arcee, Ratchet, Bulkhead, and the rest of the heroic Autobots as they battle the evil Decepticons. Now that big bad Megatron has returned with a mysterious and dangerous element, Team Prime must prepare for an epic battle.

Season 2 · Episode 26 ·
Darkest Hour
Due to Megatron's crafty plan, Optimus must make a hard decision which could affect the whole Autobot team.
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Episode 26 of season 2 of Transformers: Prime: “Darkest Hour”. Aired 2012-11-02. Watch it online free on ZapFlix.