Ice King "Do you know what Ice King means?!"
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Shape-shifter's homeworld is an alien world or dimension, seen only in a portal in the episode "Joshua and Margaret Investigations."

The dimension appears to have some sort of lava lamp appearance, as can be seen through the portal.

Another theory revolves around the origin of Jake's abilities, implying that the "portal" depicted is actually the interior of Joshua's bite. The venom of the shape-shifter, who is actually an evolved oozer (as evidenced by the green goo that comes from the wounds inflicted by Margaret), causes Joshua's body to create a clone into which the shifter then immerses himself. This theory offers an explanation as to why Jake has no innate sense of right and wrong. Kee-Oth's insistence on addressing Jake by his father's name also lends credence to the theory of cloning.