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|Book and TV episode||Evan is forced to stay with his great-aunt Kathryn after his parents leave in search of a new home in Atlanta. His time spent there takes a turn for the strange when he purchases a can of Monster Blood in an old toy store. The green slime seems like harmless fun at first, until it starts to grow bigger and bigger by the day.|
|Mr. and Mrs. Ross
|Book and TV episode||Evan's parents. They drop him off at his great-aunt Kathryn's despite his many protests.|
|Book and TV episode||Evan's great-aunt. She is an eccentric, deaf old woman with one big secret.|
|Book and TV episode||Evan's pet cocker spaniel, who stays with him during his two-week stay at Kathryn's. He grows to enormous size when he eats a sample of Monster Blood.|
|Book and TV episode||Kathryn's pet cat, which she describes as 'evil'. It is later revealed Sarabeth is a human witch in disguise, responsible for the loss of Kathryn's hearing. She cast a spell on the Monster Blood that caused it to grow.|
|Book and TV episode||A neighbor of Kathryn's. She and Evan become fast friends.|
|Book||Bored, Evan and Andy decide to check out an old toy store named Wagner's Novelties & Sundries, run by a bald-headed old man. He is reluctant to sell Evan the Monster Blood, as he deems it 'too old', but he eventually gives in.|
|Book and TV episode||A can of green slime Evan and Andy find in Wagner's Novelties & Sundries. It begins to grow larger each day, as if it's taking on a mind of its own. Soon, the Monster Blood develops a hunger for everything, and everyone, in sight.|
|Rick and Tony Beymer
|Book||Neighborhood bullies, Rick and Tony Beymer are twin brothers who love causing chaos. They tease and attack Evan and Andy, before eventually being swallowed by the Monster Blood.|
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