The Diner is a boat-shaped restaurant that has been known to serve milk, hot chocolate, coffee, and other foods. It makes its first appearance in the episode "Mermaid Man and Barnacle Boy II."
The diner looks like a boat with two glass doors in front and a life saver. Next to the boat are some coral in barrels and on the sides of the diner are three windows on each side, and on the back is a blue flag. On the boat, the word "diner" is inscribed in blue.
On one side of the diner, there are several tables and seats. On the other side is a counter and single-person seats. The kitchen is unseen, but there is a window like the one in the Krusty Krab where orders and dishes are exchanged. A jukebox is found at the end of the restaurant.
Role in series
"Mermaid Man and Barnacle Boy II"
Mermaid Man and Barnacle Boy have lunch with SpongeBob here. SpongeBob asks them what they are going to tomorrow. Barnacle Boy tells him to take his nickel and look for their theme song in the jukebox. While SpongeBob looks for the song, Mermaid Man and Barnacle Boy decide to ditch him. They go to the invisible boatmobile, however they get caught and trapped by the Dirty Bubble.
SpongeBob finds the song and goes back to the table, only to see Mermaid Man and Barnacle Boy trapped by the Dirty Bubble through the window.
Its role in the episode serves as a place for SpongeBob and Patrick to discuss about how they could become successful. Inside, SpongeBob and Patrick are talking about certain tactics about how to be successful. Even though their tactics discussed in the diner do not help give as much inspiration as seeing the Barnacle Chips billboard, their discussions do help somehow in becoming more successful.
Its role in the episode is as the place where SpongeBob tells his story about missing his name tag, and how he and Patrick had to find it before a health inspection at the Krusty Krab, to a waitress, chef, and a fellow customer.