Clurken is a large robot several times of Sonic's size. It resembles a large jellyfish that has a lavender body with two yellow cylindrical sections and in between, a section of Clurken's body has red cores embedded on it. It is surrounded by a large hemisphere-shaped dome that appears clear although small areas of it can flash with multiple colours. Attached to its main body are several white tentacles each with a lavender nozzle at the end. Clurken was 27 meters (90 feet) tall and weighed 12 tons.