Adventures of Sonic the Hedgehog (1993)

S1E13 Boogey-Mania

Dr. Robotnik takes control of a dream-manifesting device designed by Von Schlemmer, transforming it into a tool for chaos. He releases a nightmarish creature into Mobius, threatening the peace of the land. As the dream monster wreaks havoc, Sonic and his friends must band together to confront this surreal menace and restore harmony before their worst fears come to life.