In an attempt to stop evil Coop from destroying their dimension, Coop and Gorrath, assisted by alternate Jamie, launch a desperate assault on the evil Coop.
Once again, Coop mistakenly releases a giant, plant-type alien menace that wants to destroy Earth and acquire its heat. Fortunately, Megas is too big for the plant to handle, so it has to find a bigger form. Unfortunately, this is Thanksgiving, and the spore fuses with a bunch of parade balloons to this end. Coop now must prevent the plant from wrecking the holiday.
Megas XLR is a series about an overweight couch potato named Coop who stumbles across a giant robot in a junkyard. He soon discovers that the robot was sent from the future when a woman named Kiva returns to the past to claim what is rightfully hers, though Coop made so many modification to the machine so he's the only one who can fully operate it. Things also heat up when Coop learns that an alien race called the Glorft are also after his MEGAS robot, so he teams up with Kiva and his best friend Jamie to fight them off, though mostly so he can keep his new toy.