1x8 - The Little Mermaid

King Triton thinks that Ariel and Prince Thor would make a perfect couple, but not Urchin so he plays tricks on Thor to make him change his mind about Ariel. The prince gets exasperated and tells his kingdom to have war with Atlantica. Urchin stops it, and Triton explains that he wanted Ariel and Prince Thor to be a couple in the olympic sea games.