The Mermaid Man Collectible Underpants is an object that is seen in the episode, "Pineapple Invasion."
The Mermaid Man Collectible Underpants resemble regular underpants. They are green and blue in color with Mermaid Man's "M" being on them as well.
Role in the episode
The Mermaid Man Collectible Underpants are first seen after SpongeBob saw that the the underpants were damaged. SpongeBob then comments that he could have worn it 1,000 more times.
- It is unknown if there is a Barnacle Boy version of these underpants.