|Let There Be Light, Part 1|
|Season 3, Episode 25|
|Air date||October 26, 2017|
Action Monsters Save Halloween
Let There Be Light, Part 2
Grim Griefer struggles with his sense of purpose as the Monkey King's sidekick; meanwhile, Phantabus is chosen to track down a dangerous villain who planned to shroud Earth with darkness.
- You'll Find Your Part (parody of "You'll Play Your Part")
- This is Grim Griefer's first appearance after his redemption.
- Featured villain: Drillzer & Toxin Matter.
- Kai-Lan's sister, Mitta appears in this episode.