There's a big surprise in store for Mr. Sparks: He will be receiving the "Hero Teacher of the Year" award! His heroic students want to make everything special for the big celebration, and that includes making a cake. Then, Invisigirl (a former student) likes to use her invisibility to play jokes, but a joke has unintended consequences when she makes a cake invisible, and then can't find it!

Originally released by PBS, 2022. Streaming video file encoded with permission for digital streaming by Infobase on May 23, 2023.