Space Slime

The Space Slime is an unknown life form that made it's first appearance in That's the stuff.

Appearance
It looks like a material with vicious purple properties, It can shapeshift into people like Ben.

Personality
It is extremely aggressive, when it prepares to attack it produces grunts and bristles even if it is transformed.

History
Not much is known where it came from, it leaves a bottle and finds Ben and transformed into Grey Matter. The vicious material changed shape adapting the appearance of Grey Matter, beating it in combat,and locking him in a room. Shortly it meets Gwen and Grandpa Max and confuses them for Ben until it decides to copy their appearances. When Ben returns as Omni-Enhanced Four Arms, the slime shapeshifts into him as well,then Ben turns into Omni-Enhanced Diamondhead in order to defeat it, as soon as, he discovers it's weakness.

Powers and Abilities
It is very capable of shapeshifting in a type of organic life, if someone looks at it, it will copy the foe's strength and size. It can also pass through small pieces.