Mashers are metallic fish with a red body, two sharp yellow pelvic fins, one sharp yellow dorsal fin and a grey caudal fin. They also have serrated teeth, black eyes and two metallic buttons on their jaw joints.
A school of Mashers, along with a few Chop Chops and one Octus, tried to catch Sonic when he entered their underwater turf. During the chase, Sonic lead the Badniks into a seaweed, getting them stuck while he escaped. This event was recorded for Robotnik's S.S.S.S.S. Squard to see.
- The scene in "Untouchable Sonic" where the Mashers are seen appeared briefly in the unaired pilot episode for the Adventures of Sonic the Hedgehog television series.