Flatline (ROTF)

Flatline is a Decepticon in the live-action film series continuity.

Now get me down to Earth so I can scan a hearse!

A master surgeon, Flatline might be a little too eager about his work. Tasked by his commander Thundercracker with creating the next generation of Decepticon warriors, he has wasted many viable protoforms in unsuccessful experiments. He's on the verge of a breakthrough, though! Any cycle now...

Flatline was originally going to make his appearance in the Reign of Starscream story's first draft. Basically, he would operate on the monstrosity that was Devastator (who was made with the fused bodies of some construction bots like Mixmaster, Huffer, etc.), turning him into the first gestalt. Since that idea was not approved, he had to wait.