Fungus Humungous

Fungus Humungous is the 10th episode of the second season and the 36th episode of the series and aired on February 16th.

Official Description
A fungus mutant spreads through the sewers causing April and the Turtles to experience their worst fears; Leonardo must face his greatest fear.

Characters

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * Master Splinter
 * April O' Neil
 * Casey Jones
 * Fungus Humungous

Trivia

 * First and only appearance of Fungus Humungous.
 * The Mushroom dancing around Leo to the tune of "The Nutcracker Suite." is a reference to Walt Disney's 1940 animated film, Fantasia.
 * Leo has the same general fear as his other incarnations, failure since he fears of losing his brothers, and there's nothing he can do about it.
 * Mikey makes a Super Mario Brothers reference, as he jumped on the top of the mutant mushrooms and called it "Super Mikey Brothers".
 * Raph screaming "I'll bury you, cockroach!" is likely a reference to the movie Scarface where Tony Montana retorts in anger what he would do to Casper Gomez and the Diaz brothers.
 * April's worst fear is bats (her dad), Casey's fear is rats, Mikey's fear is the Squirrelanoids, Donnie's fear is April's rejection, Raph's fear is roaches (the Spy-Roach) and Leo's fear is being a bad leader.
 * Although Fungus Humungous was destroyed in the episode, one of the producer of the show said they wanted to bring him back in the future.