Mordecai, Rigby, Muscle Man, and High-Five Ghost are watching their favorite "Terrible-Horror" movie "Donut Factory Holiday". They have to get it back to the video store soon, but then they can't get it out of the VCR.
Mordecai and Rigby unplug some cables to an old synthesizer, and they have to travel to the planet of Synthos with Skips in order to re-connect them and bring Gary back to life.
Rigby has to give a speech at his high school graduation. The speech will be broadcast live on a TV show called "Inspire America," and Rigby wants to make it memorable.
In Regular Show's sixth installment of "Terror Tales," the guys gather in the house on the Dome and tell scary Halloween stories just like ol' times, only this Halloween, the stories have an extra terrifying, science fiction twist.
The guys celebrate their first Christmas in space by opening presents, eating peppermint bark and telling Christmas stories. Benson wants the stories to be more Christmas-y, but the guys keep adding scary elements, which only infuriate their boss.