Breakdown

Breakdown is a Decepticon-turned-Autobot and the secondary antagonist of Transformers: Prime.

In Transformers: Prime
During the show, Breakdown found himself intrigued by Airachnid, a female Decepticon. But after he was killed by her, Breakdown was used to revive Silas, the leader of M.E.C.H. However, when he asked Megatron for a place in the Decepticon ranks, the Decepticon leader refused and ordered Knock Out examen him. After that, Knock Out and Starscream infected him with Dark and Synthetic Energon, resulting in him becoming a mindless Terrorcon zombie carving fresh Energon. After he freed Airachnid in an attempt to drain her Energon, she killed him again.

In Stephen and Scraplets
Breakdown assisted in stoping the Scraplets from devouring every bit of metal on Sodor. When Percy leaked Energon after getting injured, Knock Out went with Thomas to get Cyber Matter, the only cure for Energon leaks. Noting that he would never forgive himself if the Scraplets chewed Knock Out to scrap, Breakdown went with Gordon, Trixie, Rainbow Dash, Sunset Shimmer, Toni and Hogi to help them.