This is a dead shark that is driven by pedals. Because it's rotting, there's a lot of gas gathering on the inside of the shark. By pulling the handle on its head, dangerous jellyfish are being shot out of the vase in the shark's mouth. It also has jet packs on its back, in case extra speed is needed, but it's mostly for emergency cases. And yes, I had tons of fun designing this one.
Photoshop CS6, January 2013.