The Space Sphere (more commonly known as the Space Core) is a corrupted personality core of male programming who first appears in Portal 2. He is the first of three cores attached to Wheatley by Chell in order to initiate a Core Transfer Procedure.

The Space Sphere is an example of a personality core that went insane. Because of this, the Space Sphere speaks in a hyperactive manner, constantly talking about his infatuation with outer space and how he would like to one day go to space.