Monster by Mistake

Monster by Mistake is a Canadian computer-animated television program aired on YTV. The story deals with an eight-year-old boy named Warren Patterson and his older sister Tracy, as they deal with bullies, ghosts, magic and an irate sorcerer. One day, the two siblings discover a creature named Gorgool in a glass-like ball. He attempts to trick them into freeing him by reading out of a book of spells and using the power of a magic jewel, but Tracy reads the spell wrong, and the spell hits Warren instead. This spell causes Warren to turn into a large blue monster whenever he sneezes. To return to his regular state, he must sneeze again. Warren has allergies, causing him to sneeze a lot, which in turn causes him to change into his monster...