The short starts with SpongeBob and Patrick in an unknown time travel machine. SpongeBob states that they can go back to the past to see young Mermaid Man and Barnacle Boy. Patrick becomes excited by this, so he takes one of SpongeBob's arms and presses the "Go" button on the time travel machine.
First, they see young Mermaid Man and Barnacle Boy in the pioneer days. SpongeBob does not like this, however, so he uses two arms and presses the Go button again. Next, SpongeBob and Patrick see Mermaid Man and Barnacle Boy riding a dinosaur in prehistoric days. SpongeBob thinks he and Patrick went too far back in the past and uses three arms to press the Go button again. Thereupon, SpongeBob and Patrick see an advanced computer Mermaid Man and Barnacle Boy. SpongeBob thinks they went too far in the future and Patrick's head accidentally falls on the Go button.
Finally, SpongeBob and Patrick travel back to when Mermaid Man and Barnacle Boy were babies. SpongeBob and Patrick hear crying from a baby crib, so they walk over to the crib to see what is wrong. Baby Mermaid Man and Barnacle Boy stop crying and demand their diapers be changed. SpongeBob and Patrick become scared of this. Suddenly, an announcer is heard and asks the audience if SpongeBob and Patrick will get to see their superheroes in their super prime, as the short ends.
|( ‣ ) Associated production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
‣ The Adventurers - Paddy Kingsland [Opening]
‣ The Pirate's Waltz - Robert White [Mermaid Man and Barnacle Boy ride old-style bicycles]
‣ African Conflict - Norman Dane [Prehistoric Mermaid Man and Barnacle Boy]
• Glowing in the Dark - Nicolas Carr [Mermaid Man and Barnacle Boy robots]
• Toy Piano 2 - Nicolas Carr, Barry Anthony [Mermaid Man and Barnacle Boy as babies]
‣ Shock (F) - Dave Hewson [SpongeBob and Patrick scream]
• Mermaidman and Barnacle Boy Action Theme - Michael Bolger, Nicolas Carr, Pat Irwin ["Will they get it right? Will SpongeBob and Patrick get to see their super heroes in their super prime?"]
- This short is available on the Heroes of Bikini Bottom, Complete Seventh Season, Big Hits: Volume 2, Triple Pack 3, The Best 200 Episodes Ever, Pilot a Mini-Movie and the Square Shorts, and Next 100 Episodes DVDs.
- On the Heroes of Bikini Bottom, Complete Seventh Season, The Pilot a Mini-Movie and the Square Shorts, The Next 100 Episodes and The Best 200 Episodes Ever DVD releases, some parts are cut out, leaving only the beginning and ending left over.