Mr. McGillicuddy is Baljeet's summer school science teacher. He gave Baljeet an A+++ on his invention, which was a Portal to Mars. Unfortunately, he never got to show the portal to the judges, due to the plug not being plugged in the outlet.
- Mr. McGillicuddy is voiced by Brian Stepanek, and he appeared in "Unfair Science Fair". He also makes an appearance on The Daze of Summer DVD as the host of the bonus feature menu.