When Fearless Leader uses the monster Humongalon to force everyone to surrender the world to him, Rocky and Bullwinkle try to stop them in the most massive monster battle ever.

When Rocky and Bullwinkle damage the largest birdbath in the world, they set out on a musical adventure. And Fearless Leader attempts to become a musical superstar so he can amass a legion of devoted super fans who will obey his every command.

A video of Rocky and Bullwinkle playing a song goes viral and they're rocketed to musical superstardom. They decide to use their newfound celebrity to launch a "save the birdbath" concert tour to restore the giant birdbath they destroyed.