The Mermaid Man & Barnacle Boy Trading Card # 54 is a highly rare edition Mermaid Man and Barnacle Boy trading card that is animated. There are now only four in existence. It appears in and is the primary focus of the episode "The Card."
Patrick buys a packet and it has all five of them, when SpongeBob buys every other pack in the store. Patrick says that he would give it to SpongeBob if he could use it for the rest of the day. Patrick uses it for things such as a key, grilling, and floss, which freaks SpongeBob out, as there were only five in existence. He also thought that if it broke, Mermaid Man and Barnacle Boy would never forgive him.
When SpongeBob receives it, it is nearly broken. Patrick then gives SpongeBob the four other limited-edition copies and he feels happy again. However, Patrick then asks for another card to use to open his house again.