When Mina's imaginary friend, Hamburger Cheese returns to her life, Bunnicula is set on a collision course with a supernatural creature he's never had to face before; a figment of his imagination.
Mina is looking at a photo album of her old imaginary friend, Hamburger Cheese and wishes that he could come back. Hamburger Cheese comes back and starts playing pranks on Bunnicula, Chester, and Harold so he can have Mina all to himself. Bunnicula then decides to face off Hamburger Cheese using only the power of imagination. After a battle of thoughts and figments, Bunnicula wins, and Hamburger Cheese has no one left to entertain. Luckily, Bunnicula and Harold have decided to help him find someone else to love: the lonely and pathetic Arthur.
- This episode is called "My Imaginary Fiend", but some TV guides call it "My Imaginary Friend".
- This episode was released on Boomerang Channel on November 8, 2017.
- This episode contradicts Adopt a Vampire, which states that Chester was adopted by Mina in the park. Whereas in this episode, she is said to have gotten him and Harold as birthday gifts.