Megablast is the opening act for headliner Zozo at the Greenville Beach Bash. However, the day takes a chilly turn when Stewey/Gooey traps all of Greenville under a snow dome!

Megablast helps out a local ice cream truck and sells out all the ice cream before Stewey can get any. He transforms into Gooey and uses ice slime to turn everyone into freeze-brained minions to rip the town apart!

After Stewey's Mom gets tired of hearing Stewey play his favourite song, he becomes Gooey and slimes anything that plays music in Greenville! When Rocket is the only one not slimed, she goes head-to-head with Gooey to get the music back.

Riley and Beatrix enter the pet tricks challenge, but they lose confidence in their act after seeing the other contestants. Meanwhile, Stewey goes full Gooey when he's told he can't have a pet and releases a penguin from the local sanctuary!