The Port-O-Head is a portable bathroom that first appears in episode "Bubble Buddy."
It is similar in shape to a Port-A-Potty. It is painted yellow, has a wooden door with a string handle, a netted window on the door and right center of the bathroom, and a clam sign with red lettering.
Role in series
SpongeBob takes Bubble Buddy to Goo Lagoon, and then places him inside the portable bathroom since he supposedly has to use it, much to the frustration of the people waiting in line. He leaves him in there for two hours.
The player can use it to switch from one character to another, the purpose being that the player may need to switch into another character in order to defeat an enemy with a certain attack or go past obstacles that can only be crossed by using a certain character's powers.