Monsters vs. Aliens (2013)

S1E30 The Beast From 20,000 Gallons

Title: The Creature from 20,000 Gallons Plot: As an asteroid races towards Earth, Team Alien is tasked with the mission to launch a rocket to obliterate it. Simultaneously, Dr. C instructs B.O.B. to engage in a game of hide and seek. Regrettably, B.O.B. chooses a risky hiding spot in the rocket's fuel. Now, Team Monster must spring into action to save B.O.B. and adjust the rocket's course to ensure it successfully strikes the asteroid.