It is revealed that Plankton has a pet Labrador Retriever. As he is controlling SpongeBob via mind control, they walk into a room and Plankton says "This is my lab!" rather loudly. In the room, there is a large theater-like screen showing a video of a Labrador above water, barking in a seemingly suburban-like area.
He is seen in the "Plankton!" segment of the book.
Plankton's lab also appears in the second SpongeBob level in the console version.
- The end credits of the episode list the dog as "Alex."
- This is a pun, as when Plankton was taking SpongeBob to his laboratory, he walked in this room and said "This is my lab!," and then he walks over and says "This is my laboratory!"
- The dog is specifically a Labrador Retriever, which is a type of gun dog.