Mermaid Man and Barnacle Boy (stylized as Mermaid Man & Barnacle Boy) is a series of episodes featuring superheroes Mermaid Man and Barnacle Boy and their biggest fans, SpongeBob SquarePants and Patrick Star.
|Mermaid Man and Barnacle Boy||August 21, 1999|
|Mermaid Man and Barnacle Boy II||April 8, 2000|
|Mermaid Man and Barnacle Boy III||November 27, 2000|
|Mermaid Man and Barnacle Boy IV||January 21, 2002|
|Mermaid Man and Barnacle Boy V||June 1, 2002|
|Mermaid Man & Barnacle Boy VI: The Motion Picture||October 7, 2005|
- Mermaid Man-All episodes
- Barnacle Boy-All except for V
- SpongeBob-III (Man-Sponge) and V (The Quickster)
- Patrick-III (Boy-Patrick) and V (The Elastic Waistband)
- Squidward-V (Captain Magma)
- Sandy-V (Miss Appear)
- Reflecto (as Squidward)-I
- Jumbo Shrimp-II (not seen)
- Sinister Slug-II (not seen)
- Atomic Flounder-II
- Dirty Bubble-II, V
- Man Ray-III, V
- Barnacle Boy-V (Barnacle Man)
- Kelp Thing-VI
- The episode "Mermaid Man & Barnacle Boy VI: The Motion Picture" is the only episode in the series to have a title card that uses a green background.
- The comic book-esque action cards (i.e. "POW," "BANG," "KING ME") that frequently show up in the series parody the 1966 television show Batman, which would use similar effects to punctuate fight scenes.