Spiny DocFish

The Spiny DocFish is Dr. Muto's fourth morph, transforming him into a fish.

At 700 isotopes, the formula for the Spiny DocFish is unlocked; once 35 DNA from Roaches, 35 DNA from Fireants, 15 DNA from Monkeys, and 5 DNA from Charks have been collected in total, the Spiny DocFish is playable. With 30 DNA from Airbags, the second stage of the Spiny Docfish, the Electric Eel, is unlocked.

Appearance
The Spiny DocFish is a small blue fish with spines on its back. It has three fins: two on its sides, akin to Dr. Muto's arms, and one tail fin. The Spiny Docfish has a sucker on its mouth that allows it to swallow enemies and other objects. Dr Muto's hair, glasses, and mustache are retained on the Spiny DocFish, and his labcoat perfectly fits the small fish. The Spiny DocFish makes no unique sounds, staying silent when damaged.

As the Electric Eel, the Spiny DocFish becomes considerably skinnier and turns a gray color.

Usage
The Spiny DocFish is, appropriately, the only one of Dr. Muto's morphs that can swim underwater without drowning, and the only morph (other than Muto himself) that can fall into water and not drown after three seconds.

In water, the Spiny DocFish proves to be easily maneuverable, and is hard to hit as long as he keeps moving. His attack comprises of shooting a barrage of spines at his enemies; this attack becomes less effective as the enemies' distance from the Spiny DocFish increases, since the spines both have short range and a large spread.

By holding the attack button, the Spiny DocFish stands in place and revs up, preparing for a dash attack. This dash attack tears through enemies quickly, and proves to be the Spiny DocFish's most deadly defense - as long as there is time to rev up the attack, that is.

The Spiny DocFish can jump out of the water, given enough speed, and grab objects (such as isotopes) out of the air. The Spiny DocFish can survive out of water, but has limited mobility, slowly shuffling his way across the ground and unable to attack.