With the trolls hiding out in Arcadia, AAARRRGGHH!!! goes undercover to see what Gunmar is up to. A potential rival brings out Jim's jealous side.
With the trolls hiding out in Arcadia, AAARRRGGHH!!! goes undercover to see what Gunmar is up to. While that occurs, Claire catches a huge cold from her experience with the staff and signs up with her friends for a music contest occurring.
- Kelsey Grammer as Blinky
- Anton Yelchin as Jim Lake Jr.
- Charlie Saxton as Toby Domzalski
- Lexi Medrano as Claire Nuñez
- Jonathan Hyde as Mr. Strickler
- Fred Tatasciore as AAARRRGGHH!!!
- Clancy Brown as Gunmar
- Mark Hamill as Dictatious
- Chad Hammes as Mr. Hammes
- Lena Headey as Morgana
- Anjelica Huston as Queen Usurna
- Amy Landecker as Barbara Lake
- Colin O'Donoghue as Douxie
- Yara Shahidi as Darci Scott
- Lauren Tom as Nomura/Mary Wang
- Jimmie Wood as NotEnrique
- The events of this episode take place two weeks after the Part Two finale "In the Hall of the Gumm-Gumm King".
- Barbara starts to paint pictures trolls (her first painting being Blinky), hinting that her memory is returning.
- In the opening scene, we see a flash of light land in Arcadia. This is presumably the aliens Prince Krel and Princess Aja from 3Below landing in Arcadia for the first time.
- Goof: The first episode of 3Below shows the ship crash-land in Arcadia at dawn, whereas in this episode, the ship is seen landing at night.
- Goof: The Heartstone appears to be alive when Dictatious is with Usurna within it.
- The character of Mr. Hammes, who is running against Ophelia Nuñez for city council is most likely named after his voice actor, Chad Hammes.