Kamen Rider Drive Saga: Kamen Rider Brain

Kamen Rider Drive Saga: Kamen Rider Brain

仮面ライダードライブサーガ: 仮面ライダーブレン

Part 1
Brain awakens and finds himself kidnapped by an evil organization named Mu (無 Mu, lit. nothingness), whose primary aim is global conquest. Chosen for his high IQ (600), his body was rebuilt and he was about to be brainwashed when the process is interrupted. Brain is rescued by Professor Crystal Peppler, the scientist who rebuilt his body, and notes that the latter's face and voice seem familiar. As Brain discovers a transformation driver in his possession, the two are confronted by the members of Mu for Peppler's apparent betrayal of the organization. Brain transforms into his Super Evolved Roidmude form and fights but is seemingly thrown off the building to die when he returns again shortly after, having transformed into a Kamen Rider. As Kamen Rider Brain, he effortlessly defeats most of the Mu's members, before escaping with Peppler's on his Motorcycle.

Part 2
As Brain and Crystal Peppler are in hiding, Brain tries to transform but cannot. Peppler suggests that Brain was able to transform before because he was in grave danger. Peppler also reveals that he chose to revive Brain not because he would be a great Kamen Rider, but because he is the weakest villain general so far. Brain reminds Peppler that Mu said they need his IQ of 600. Peppler says that "600" is not Brain's IQ, but his brain capacity in gigabytes, which is very lower than most commercial hard drives.