Bittersweet Sixteen is the ninth episode of Trollhunters.
Jim's 16th birthday is full of surprises, including the arrival of a terrifying new species of troll that's immune to the effects of sunlight.
Jim is excited to test-drive a Vespa for his birthday but things quickly go awry when he must fight Bular's flying Vulture Troll who was sent to hunt him down.
- Kelsey Grammer as Blinky
- Anton Yelchin as Jim Lake Jr.
- Charlie Saxton as Toby Domzalski
- Lexi Medrano as Claire Nuñez
- Ron Perlman as Bular
- Jonathan Hyde as Mr. Strickler
- Fred Tatasciore as AAARRRGGHH!!!
- Tom Kenny as Otto Scaarbach/Vespa Dealer
- Amy Landecker as Barbara Lake
- Laraine Newman as Miss Janeth/Nana
- Victor Raider-Wexler as Vendel
- Jimmie Wood as NotEnrique
- Steven Yeun as Steve Palchuk
- Jim turns sixteen in this episode. It is also revealed that his father disappeared on his fifth birthday, which is one of the reasons why birthdays aren't Jim's thing.
- A humorous list of things not allowed by the airline is seen at the end of the episode: roller skates, mustaches, maces, sharks, bombs and poop.
- Steve is seen driving a blue Vespa, unlike the red Vespa in the previous episode.
- Title: The title likely refers to the book of the same name, co-written by Carrie Karasyov and Jill Kargman