Alex is a devoted single parent struggling to raise their child, Sam. They would do anything for Sam, and draw on their love for Sam whenever they need strength. Recently Sam has acquired an imaginary friend they call Mr. Giggles. Mr. Giggles has been the culprit in a series of capers involving Sam and their friend Robin. A chemist at the local chemical plant, Alex relies on their background as a scientist to rationalize the strange happenings around them.