Kamen Rider 1, Kamen Raidā Ichi-Gō or Kamen Rider New 1 is the third form of Kamen Rider 1. Takeshi Hongo is captured by Shocker and taken for a second reconstruction surgery, which gives him abilities surpassing his original ones. Hongo uses self-hypnosis to escape Shocker's brainwashing, turning their own power against them once again.
The upgrade allows Hongo to transform instantly, without needing external wind sources, gives him enough power and durability to survive a subzero trap and even a nuclear bomb close range with no apparent damage, and gives Hongo the versatility for different techniques that can satisfy demands otherwise unattainable in his previous forms, giving Hongo the nickname "Skill of 1"; this capability was later passed to Kamen Rider V3, with his 26 skills or techniques.
This form also gives Hongo access to Rider Power, a temporary boost in Kamen Rider 1's battle power, triggered with a switch in his new Typhoon belt, that greatly increases his strength, making Kamen Rider 1 superior to Shocker's other creations.