Will Blake

Will Blake is the main antagonist of the Goosebumps book, The Werewolf of Fever Swamp, and a minor antagonist of the Goosebumps film.

Goosebumps (film)
In the Goosebumps film, Will Blake appears in an abandoned Supermarket going through the meat aisle until Champ accidentally alerts him by opening a soda. He searches for them throughout the Supermarket, Zach tries to throw him off, but fails. The werewolf chases them out the market into a parking lot, only to be slammed by Lorraine's car and sent flying into a dumpster. He reappears with the other monsters as Slappy leads them on an attack Madison High School to kill of R.L. Stine. He corners Taylor and is about to attack her, but Champ arrives and bites him with his "silver teeth filings" making the wolf run off.

The werewolf appears again with the monsters going after a bus Stine and the kids are using to escape only for it to be a decoy rigged to explode when the werewolf and the Abominable Snowman open the doors. He regenerates and lead Slappy to the Stine. Zach managed to finish the book just as the monsters reached them, and promptly opened it, causing a vortex to suck the werewolf and all the monsters in the book.