Breakdown (WFC)

Breakdown is described as extremely paranoid that everyone and everything is out to get him. He prefers to do his duties in anonymity, and transforms into a Cybertronian car.

War For Cybertron
Breakdown assists Megatron in his search for the Omega Key, which grants access to Cybertron's core, and helps defeat Autobot leader Zeta Prime. However, it turns out that the Omega Key is actually only a locator device for the actual key, which turns out to be much bigger.