Caterkiller

Caterkiller is a caterpillar-based badnik created by Dr. Ivo Robotnik. It is distinguished by his numerous spiked segments that can detach from each other with ease. He appears to be a high ranking badnik on the Island of Misfit Badniks.

Early Battles
Caterkiller was one of the first badniks to fight Sonic the Hedgehog, attempting to block Sonic's path before being smothered and segmented by a wave of Mega-Muck. (OSM: #0)

He was mostly seen in crowd scenes for badniks including some run-ins at Casino Night Zone, an ambush on a staged wedding between Sonic and Princess Sally, before becoming the first badnik to fight Sonic at the Robo-Hobo Jungle. Sonic pointed out that Caterkiller was the first badnik Sonic encountered. Sonic managed to get some information regarding Nack the Weasel from Caterkiller after segmenting Caterkiller again (twice) and threatening to drag Caterkiller's head against the road at Sonic speed. (StH: #1, #18, #40)

Super Model
A significantly larger train-based Caterkiller was unleashed by Dr. Eggman for the task of terrorizing numerous towns by plowing through them. Caterkiller plowed Furville before heading for Knothole Village. Sonic was able to phase himself and Tails through the armor so that Tails could reprogram it to run off a cliff and into the sea. The Caterkiller took all of its segments with it this time. (StH: #119)

Later Fights
When Sonic decided to investigate the Island of Misfit Badniks, Caterkiller and numerous other badniks ambushed him. Sonic quickly trashed them, segmenting Caterkiller again, before Pseudo Sonic entered the fray. After this fight caused the island to sink, with the badniks faking their deaths, Caterkiller, referred to as a Commodore, watched Sonic dash away, completely oblivious to the badniks' survival. He promised that they would meet again soon. (StH: #170)

Their revenge scheme of enlarging Pseudo Sonic was interrupted by the Forty Fathom Freedom Fighters, who kept smashing up badniks foolish enough to stop them. Caterkiller led the last wave consisting of Jaws, Bat Brain, and Buzzbomber. Caterkiller was able to wrap himself around Ray before Pseudo Sonic knocked them all away. Big Fluke sat on Pseudo Sonic and crushed all of the badniks, including all of Caterkiller's segments, into a cube. (StH: #185)

Abilities
As a caterpillar-based badnik, its numerous segments can be used to hit opponents. Its length, varying from issue to issue, can be used to its advantage as the far end is likely moving the fastest, and there is a chance of wrapping itself around its opponent as Ray learned. Fortunately, the segments detach with little force.

As a train-based badnik, it has many segments, nigh indestructable armor, and great speed. It appears to be capable of plowing through cities, but not much else. It has significantly less intelligence than the smaller bog-based badnik, as a simple computer with no manner of A.I. runs the whole robot.

Background Information
Caterkiller is based on the badnik from multiple Sonic games. In Sonic the Hedgehog, Caterkiller (known as "Nal" in Japan), appeared in the Marble Zone (Genesis only) and the Scrap Brain Zone (both Genesis and Game Gear) and consisted of only 4 segments, including the head. The color scheme used in the Genesis version was Caterkiller's color scheme in the comics (Game Gear had a pink Caterkiller). A blue variation appeared in Sonic and Knuckles in the Sandopolis Zone, and another grey variation with a purple head appeared in the Green Grove Zone in Sonic Blast. In all versions, the head is the only point that can be attacked safely, though the spikes cause no trouble in the comics. Like the comics, the original Caterkillar is known to see its segments scatter, but only if attacked wrong.

Writer Karl Bollers revealed that one of the long scrapped plots would have have A.D.A.M. reactivate Caterkiller (the train version), as part of his rebellion against Dr. Eggman. Though A.D.A.M. did rebel (for different reasons than planned), Caterkiller is likely still underwater, assuming the 40FFF didn't do anything about it.