Waterballs are balls of water that first appear in the episode "Mermaid Man and Barnacle Boy."
Role in series
"Mermaid Man and Barnacle Boy"
Barnacle Boy attempts to use a water ball against SpongeBob and Patrick, but the balls are harmless against them.
Battle for Bikini Bottom
They are mentioned by SpongeBob when he enters Shady Shoals Rest Home and talks to Barnacle Boy.
Friends Forever
They are seen in the "Mermaid Man and Barnacle Boy" segment of the book, where they play the same role as in the episode.
Gallery