After the events of the Storm King, Twilight realizes she never invited her old student to the Friendship Festival, and SpongeBob himself misses his friends in Equestria. But now, with a little magic, SpongeBob and his friends set up a special reunion between them and their friends in Ponyville. But Starlight Glimmer fears she might be replaced with Twilight's old student, and Plankton secretly returns for revenge against the ponies.

Thanks to SuperPinkBrony12 and The-Doctor-W for their help!