- Aaron Bartkiw as Larry Boyd
- Courtney Greig as Lily Turnbull
- Ric Reid as Mr. Boyd
- Alison Hope as Mrs. Boyd
- Christopher Bondy as Mr. Turnbull
- Suzanne Cyr as Mrs. Turnbull
- Dan MacDonald as Dr. Murkin
- Josh Wittig as Jared
- Mauricio Rodas as Manny Hernández
- David Talbot as Man in Closet
- Demo Cates as Carl Summers
Larry Boyd is having a bad day. He's been chased by dogs, his band sounds pathetic, and his allergies seem to be getting worse. It's not just a bad day, it's a bad hair day. Suddenly he is growing thick, long hair on his arms and legs. Even more troubling, his friends seem to be disappearing. Could that old bottle of Instant -Tan they used could that have something to do with these strange occurrences? Can Hairy Larry get to the bottom of this before he ends up like the rest of his friends: hair one day, gone tomorrow?
Differences from the book
- Unlike the book, Larry doesn't care much about his hair.
- Kristina, another of Larry's friends in the book, is not present in the episode.
- In the book, Lily's surname is Vonn, in the episode, it is Turnbull.
- In the book, Larry collects the bottle of INSTA-TAN to give to Dr. Murkin to study and find a cure, only for dogs to chase him and cause him to accidentally drop and break the bottle. In the TV version, the bottle is accidentally thrown in the trash and Larry freaks out when he finds out about it.
- Larry grows brown hair instead of black hair.
- Larry notices hair growing on both of his palms while having dinner with Lily's family, not in class.
- In the book, Larry's fur disappears every time he shaves himself but regrows if it's left alone long enough. In the episode, the fur disappears every time Larry rests but reappears if he expends energy.
- The episode takes place in the span of 3 days, while the book's story takes place over at least a week.
- The episode takes place in spring instead of winter.
- The Battle of the Bands plot is replaced with Larry and his friends practicing for a gig at a children's birthday party. Thus, Howie does not appear in the episode.
- The tanning lotion reads "INSTANT TAN, GIVES YOU AN INSTANT TAN" instead of "INSTA-TAN, RUB ON A DARK SUNTAN IN MINUTES".
- In the book, Manny plays a prank where he pretends that his skin is falling off. In the episode, Larry pulls the prank.
|Title||Release date||Media type|
The Blob That Ate Everyone
|September 7, 2010||DVD|
|August 26, 2014||DVD|
- This is one of the three episodes that internet personality JonTron reviewed for his 2013 Halloween special. The other two were "Don't Go to Sleep!" and "Ghost Beach". All of which, however, were reviewed in a negative light.
- The ending reveals that Larry is the dog that gets yellow eyes in the theme song. Larry breaks the fourth wall by saying this "looks familiar"
- A Venom poster can be seen on Larry's wall.
- The script reveals that the parents in town took part in the experiment because they couldn't have kids of their own. This is also mentioned in the Goosebumps Presents book. 
- This is the only episode written by Micheal Short, as well as the only one directed by David Warry-Smith.