Mermaid Man & Barnacle Boy: Defenders of the Deep is a downloadable digital collection available on iTunes. It was released in 2012 and contains episodes all about Mermaid Man and Barnacle Boy. It has a total of two episodes from season 1, one episode from season 2, two episodes from season 3, one episode from season 4, one episode from season 5, two episodes from season 6, and one episode from season 8.
"Mermaidman and his young associate Barnacleboy fight against the forces of EEEEVILLLL! Well, they did, and they’re about to again since SpongeBob and Patrick have brought them out of retirement. So hop in the Invisible Boatmobile and hang on for the ride of your life with these 10 episodes featuring heroes, villains and all the broccoli you could ever want. Beware the raging whirlpool, don your official Mermaidman & Barnacleboy breakfast bites, and behold the greatest wall of secret gadgetry EVER – but don’t touch! This collection is the quintessential um, collection, of the most hero-y heroic adventures in the deep, like when Mermaidman and Barnacleboy help get the lid off SpongeBob’s mayonnaise jar, Barnacleboy joins the dark side and E.V.I.L., SpongeBob and Patrick fill in for their heroes at a shuffleboard tournament, Man Ray is freed from a vat of frozen tartar sauce and so much more. By the power of Neptune, Mermaidman and Barnacleboy, UNITE… in one awesome collection!"
|6a - "Mermaid Man and Barnacle Boy"|
|20b - "Mermaid Man and Barnacle Boy II"|
|31a - "Mermaid Man and Barnacle Boy III"|
|45a - "Mermaid Man and Barnacle Boy IV"|
|52b - "Mermaid Man and Barnacle Boy V"|
|67b - "Mermaid Man & Barnacle Boy VI: The Motion Picture"|
|94b - "Mermaid Man vs. SpongeBob"|
|113b - "The Card"|
|117a - "Shuffleboarding"|
|163a - "Mermaid Man Begins"|
|List of home videos|
- The artwork of Mermaid Man and Barnacle Boy on the cover is reused from the Heroes of Bikini Bottom DVD.
- A similar compilation, The Adventures of SpongeBob SquarePants, was released three years later including the same episodes.
- Mermaid Man and Barnacle Boy's names are misspelled on the description as "Mermaidman" and "Barnacleboy," with no spaces in between nor capitalized second parts.
- This also happened in the DVD releases.