The Funky Phantom

Pigskin Predicament (1x11)

Air date: Nov 20, 1971

The kids return to their high school for the big ball game (""You two are players, I'm the cheerleader, and Elmo's the mascot""). Two robbers steal a rich lady's necklace, and hide in the football, they disguise themselves as players to get the necklace back. Naturally, they're found out, and arrested.