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Season 1 Episode
- Season 1 These Two Are A Best Match
- Season 1 Innocent Runaway
- Season 1 Borderline of Justice
- Season 1 The Testimony Will Be Zero
- Season 1 Dangerous Identity
- Season 1 Moonsault of Anger
- Season 1 The Devil's Scientist
- Season 1 Memory Starts to Talk
- Season 1 The Trap of Project Build
- Season 1 Technology of Destruction
- Season 1 Burn, Dragon
- Season 1 Conspiracy Theory
- Season 1 Who Takes Off the Veil?
- Season 1 The False Kamen Rider
- Season 1 Judge Sento Kiryū!
- Season 1 The Weaponry Hero
- Season 1 The Outbreak of the Rider Wars
- Season 1 The Golden Soldier
- Season 1 The Forbidden Item
- Season 1 Devil's Trigger
- Season 1 The Unstoppable Hazard
- Season 1 Victory of Tears
- Season 1 The Phantom of the West
- Season 1 The Man Called Rogue
- Season 1 The Idol's Awakening
- Season 1 The Treacherous Deathmatch
- Season 1 The Counterattack Hero
- Season 1 The Genius Arrives With a Tank
- Season 1 The Opening Bell Rings
- Season 1 The Truth of the Pandora Box
- Season 1 Surge Out, Magma!
- Season 1 Programmed Tragedy
- Season 1 The Final Weapon: Evol
- Season 1 The Best Match is Dissolved
- Season 1 Tower of Destruction
- Season 1 Evolto Hunts Planets
- Season 1 The Ultimate Phase
- Season 1 Mad World
- Season 1 The Unstoppable Genius
- Season 1 The Final Revolution
- Season 1 The Truth of the Best Match
- Season 1 Legacy of Doubt
- Season 1 Another Build
- Season 1 The End of Evolto
- Season 1 The Scientist of Hope
- Season 1 An Oath to Be the One
- Season 1 Zero Degree Flames
- Season 1 To a World of Love & Peace
- Season 1 The Tomorrow Build Will Create
Kamen Rider Build - Season 1 Episode 21 The Unstoppable Hazard
5.50 24 minutes Despite knowing the risks, Sento uses the Hazard Trigger to empower himself against Kazumi's three subordinates. After losing his consciousness and killing one of them, Sento is struck with guilt and refuses to keep fighting, until Soichi gives him an alternative.
