Morph

Dr. Muto's morphs allow the doctor to transcend his physical faults and accomplish otherwise impossible tasks. Through the collection of isotopes, the formulas for each morph are unlocked and detailed in the scrapbook; once the appropriate amount of DNA is extracted from fauna, the morph is accessible to Dr. Muto.

Gerbillius Doctorus
Main Article: Gerbillius Doctorus

Gerbillius Doctorus is the first of Muto's morphs, and the only one unlocked without collecting DNA. Transforming the doctor into a mouse, Gerbillius Doctorus can access mouseholes and other small areas otherwise inaccessible to Muto.

Doczilla
Main Article: Doczilla

Doczilla is the second of Muto's morphs, and is unlocked on Totltec by collecting 250 isotopes, 10 DNA from monkeys, and 20 DNA from roaches. Mutating Muto into a a gorilla, Doczilla utilizes the power of his brawn to take down enemies quickly and brutally. With increased dexterity, Doczilla can also traverse large gaps by climbing rope and swinging from ledge to ledge.

ArachniDoc
Main Article: Arachnidoc

Once Muto obtains 450 isotopes, 30 DNA from roaches, and 30 DNA from fireants, ArachniDoc is unlocked, and is first playable on Totltec. As ArachniDoc, Muto gains the ability to shoot web, allowing for increased mobility - as long as a spider web is around. ArachniDoc can also shoot spider eggs, either as bombs or as grenades that explode on impact, giving ArachniDoc the ability to eliminate enemies from afar.

Spiny DocFish
Main Article: Spiny DocFish

With 700 isotopes, 35 DNA from Roaches, 35 DNA from Fireants, 15 DNA from Monkeys, and 5 DNA from Charks, the Spiny DocFish is unlocked, on Aquem. Allowing Muto to breathe underwater, the Spiny DocFish can enter underwater locations inacessible to any other morph. The Spiny DocFish can quickly dispatch his enemies as well, with use of his spines (thrown as a projectile) and his charge attack.

TeraDoctyl
Main Article: TeraDoctyl

With 1400 isotopes, 10 DNA from Airbags, 20 DNA from Tarfish, 5 DNA from Peliqui, and 20 DNA from Charks, the TeraDoctyl is unlocked on Flotos. TeraDoctyl allows Muto to fly in the air, allowing increased maneuverability around the world. TeraDoctyl can also rapidly spit in front of him as a form of attack, allowing quick dispatchal of hostile threats.