Neo Organism

The Neo Organism is a pool of a living fluid that relies on the container it lives to survive. It was created by Doctor Mochizuki in his attempt to create a "perfect lifeform". It took on the deformed appearance of the doctor's son Hiroshi Mochizuki but lacked emotions and having a god complex. The Neo Organism then held its creator captive when he refused to complete its evolution. It then assumed the grotesque form, Doras to find Hiroshi and force the doctor to complete its evolution so it would destroy the human race. After absorbing ZO it proceeded to kill Hiroshi, fortunately music from the boy's pocket watch awakened ZO as he burst out of Doras' body. With the Neo Organism's life support destroyed by the doctor and reverted to its normal state, ZO destroys it with his Rider Kick, ZO Kick.

Doras is capable of regeneration, even from severe wonds and injuries. It is shown to upgrade itself with organic and inorganic material as well as alter its form into an orb or a bladed projective, and produce Doras Monsters from itself. After Doras absorbed Kamen Rider ZO it became the more powerful, Doras Strengthened Form.

In an S.I.C. Hero Saga crossover with Kamen Rider J, Doras gains the power of the Fog Mother, gaining different forms as a result, Red Doras Ver. 2, Doras Ultimate Form, and Fog Doras.

Kamen Rider x Kamen Rider Double & Decade: Movie Wars 2010
In the epilogue film of Kamen Rider Decade, Super Doctor Shinigami, revives the Neo Organism to destroy Kamen Rider Decade. In its deformed child form it refers to Shinigami and the Bee Woman as "Mama" and "Papa". Still when Bee Woman comes into contact with it during her fight with Electro Magnetic Wave Human Tackle she gets absorbed and the Neo Organism becomes Doras. Doras then goes on a rampage destroying anything in its path including Colonel Zol. Doras overpowered Decade and his comrades until the Riders from the Nine Worlds arrived to help and with Decade Complete Form turning them into their Ultimate Forms they destroy Doras. But the Neo Organism attacks with a Mammoth Mech which later goes under the control of the Dummy Dopant.

After the Super Crisis Fortress is destroyed and the Neo Organism survives it merges with the Dummy Dopant to form Ultimate D. Ultimate D was able to overpower the riders it fought easily. Fortunately Decade produced the Kamen Rider W Final Form Ride Card to make Kamen Rider Double into CycloneCyclone and JokerJoker and with the Final Attack Ride Card Triple Extreme they destroy Ultimate D.

Ultimate D is described as the most powerful and evil kaijin of Super Shocker and this is no lie as it was able to easily overpower many Kamen Riders. It has the ability to shoot out orbs of energy and greater fighting skills than any of Doras' forms.