Doctor Thorne (2016)

S1E16 Crazy Carnival Caper

Title: Wild Fair Fiasco Plot: The gang returns to Central High for the annual carnival and unexpectedly encounters their former science teacher, Mr. McDabble, who has invented a powerful ruby laser capable of slicing through solid metal. However, chaos ensues when the precious ruby mysteriously disappears. The kids must team up to uncover the truth behind the vanishing gem and solve the mystery before the carnival ends.