What is that Thing?

What is that Thing? is the first half of the ninth episode of Season 4. It originally aired on November 1st, 1999, along with "Buster's Best Behavior."

Summary
Arthur, Francine, Brain, and Muffy each find the same metal bobbin, but don't know what it is. It happens to fit exactly what they need at the moment it appears.

Trivia

 * Muffy uses the bobbin to save a plush anteater of hers named "Andy". It wears Arthur's sweater - a clever in-joke.
 * Nemo's design has changed in this episode after his debut in Francine and the Feline, and has remained in subsequent seasons.