Kappa was deployed alongside its brother units Iota and Lambda to the Sand Hill Zone in order to intercept Sally Acorn, Antoine D'Coolette, and Bunnie Rabbot-D'Coolette of the Knothole Freedom Fighters as they attempted to retrieve a Chaos Emerald. (StH: #266)
- Kappa was never formally introduced in the comics prior to Worlds Collide, but his fate was revealed in the (now defunct) Sonic Universe blogs.
Kappa's appearance as seen in the post Worlds Collide reality is that of the standard E-100 head and torso situated atop tank treads with two large cylinder "arms" that are each fitted with four drills. It's head is the standard E-100 yellow with green eyes, it's "belly" is white, and the section connecting it's torso to it's treads is gray matching it's drills. The rest of the unit is green.