|Challenge of the Superfriends|
|Episode name pun on: Challenge of The Superfriends TV series|
|Airdate:||April 28, 2006|
"Cuckoo for Coco Cards"
"The Big Picture"
When a large, dangerous imaginary friend begins to destroy the city, Imaginary Man comes to stop him. When Mac becomes his sidekick, Bloo becomes jealous and joins forces with Imaginary Man's enemy, Nemesister.
- This episode borrows numerous trademark elements from "The Powerpuff Girls," another popular show by Craig McCracken.
- Mac references G.I. Joe, Fat Albert, Teenage Mutant Ninja Turtles (specifically Michalengelo) and Scooby-Doo whenever he tries a new catchphrase.
- The show Jackie Khones was watching was a scene from "One False Movie."
- Bloo resembles Darth Vader when he becomes Lord Uniscorn.
- The scene in which he is transformed into Lord Uniscorn is similar to the scene in which Anakin Skywalker is transformed into Vader in Revenge of the Sith.
- He also makes a reference to the famous "I am your father" scene from The Empire Strikes Back, quoting it almost word-for-word.
- Bloo's repetitive, extravagant speech as Lord Uniscorn is likely a reference to the way Mojo Jojo talks.
- Bloo's superhero look appears as an unlockable bonus costume for him in Cartoon Network Punch Time Explosion XL.
- This is the only episode shows Mac's karate skills.
- Mac: "Hey, hey, hey."
- Mac: "And knowing is half the battle."
- Mac: "Jinkies!"
- Mac: "Zoinks!"
- Mac: "Holy habadashery!"
- Bloo: "(Singing tune) DadadadadadadadadadundundundadundundundundundadundaDADADA!!!!!!!
- Bloo to Mac: "Mac, I am your father!'