Monster Blood is the 34th episode in the Goosebumps TV series. It is based off the 3rd book in the original series.
Synopsis[]
While staying with his weird Great Aunt Kathrine, Evan and his new friend Andy find a jar labeled "Monster Blood" in a room Aunt Katherine instructed Evan must not enter. It's fun to play with at first. And Evan's dog, Trigger, likes it so much, he eats some! But then Evan notices something weird about the green, slimy stuff--it seems to be growing. And growing. And growing. And all that growing has given the Monster Blood a monstrous appetite.