Piranacon

Piranacon is the combined form of the Decepticon Seacons.

He's not to be confused with the regular-sized Piranacons who serve the Quintessons.

Fury from the Deep
Piranacon was hiding out in Devil's Cove for several years after the Seacons' ship crashed there, killing their leader, Snaptrap. Severely damaged and lacking a leader, Piranacon's intelligence was severely limited, and he resorted to destroying ships to use as spare parts. When Bumblebee, Miko, Jack, and Raf arrived, Piranacon attempted to destroy them, but was (presumably) killed when a loose boulder from the kids' escape plan embedded itself in his face.