The caterpillar as seen in the startup for Flash Cat
The bug consists of a lime green oval with three pink legs on each side in the levels. On the front of its body is its head, which consists of two levers to hold on to and two antennae.
The bug's actual face is not revealed, unlike the Flash Cat, who has half of its face revealed in levels. In the startup, the whole bug can be seen with a large, long lime-green body and two beady eyes with numerous pairs of legs.
Flash Cat rides the bug for the entire course of the game. Flash Cat uses the bug as a vehicle. The bug has three health, like Flash Cat, and explodes when hit three times.
Whenever a power up is picked up, when it is used, the bug is commanded by the Flash Cat to be used. The Flash Cat does not use the pick up itself, the bug initiates the pick up to be used, which is used on itself.
- A very long bug in the startup of Flash Cat appears, with the word "NITROME" on its back. This bug does not have levers attached to its head.
- The bug the Flash Cat rides may be robotic, or semi robotic, as the levers seem to go into its head.