It's the day of Beach Bash, a big beach concert in Greenville. Megablast is the opening act, but Riley can't help but feel a little disappointed they don't get to play a full set, like headliner Zozo. Meanwhile, Stewey wants a snow globe, but when his mom tells him to wait for his birthday, he goes into a super snit, transforms into Gooey and traps all of Greenville under a snow dome of his own making! Megablast transforms into Rocket, Thunder and Metallix to get the dome down in time for Beach Bash.