SEASON 2011 • EPISODE 25
SpongeBob SquarePants
"Mermaidman Begins / Plankton's Good Eye"
Date Aired: Sep 23, 2011 (United States)
SpongeBob and Patrick learn the secret origins of Mermaid Man and Barnacle Boy from the heroes themselves. / Plankton acquires a second eye, which changes his personality.