Miraculous: Tales of Ladybug & Cat Noir Season 3 Episode 16

There is a new exhibit in the museum. As Alya digs deeper to find out about the Miraculouses, she sees that the symbol that is with every past Miraculous holder- that Marinette recognizes as the symbol on the Miracle Box- is also on the new exhibit. Master Fu recognizes the new exhibit as a sentimonster he accidentally created in the past which destroyed the Order of the Guardians.