Superdude
Wikisimpsons - The Simpsons Wiki
Superdude was the year-four's pet gerbil. He was named by the students, and only appearance in 2F16 "Who Shot Mr. Burns (Part One)" at the beginning of the episode. His unfortunate death was caused by him being squished to death by his own water bottle. "Who Shot Mr. Burns (Part One)" Was aired On the 21st of May, 1995.