Bumper

Bumper was a security agent."Their names were Bumper and Fastback. Do you remember them? You killed them both to protect your organization which you later started calling a revolution."

- Sentinel Prime to Megatron about Bumper and Fastback.

Transformers: Exodus
Bumper and Fastback were dispatched by Sentinel Prime to infiltrate Megatron's organization. When their identities were exposed, Megatron brutally murdered them—an act for which Sentinel blamed both Megatron and himself.

Novel Series

 * "Exodus" (Debut/Killed)

Trivia

 * The same fate befell the original Bumper and Fastback in The Transformers: Megatron Origin.