Ep. 3: The Obsessive Scientist explores Dr. Genus's dangerous artificial evolution theories and his interest in Saitama.
Aired on October 19, 2015

Saitama and Genos gather intelligence regarding The House of Evolution and its founder, Dr. Genus. This scientist holds dangerous concepts concerning artificial human evolution. Concurrently, Dr. Genus discovers Saitama's remarkable strength. He subsequently formulates his own plans involving One-Punch Man. The narrative focuses on the intersection of the heroes' investigation and the scientist's ambitions. Information is obtained about the organization and its leader. Dr. Genus's dangerous ideas are highlighted. His reaction to Saitama's power drives the plot forward. The episode details the growing connection between the protagonists and the antagonist's research.
Episodes
- Ep. 1 · Saitama reflects on the loss of meaning despite his overwhelming one-punch hero strength
- Ep. 2 · Genos confronts a monster from The House of Evolution near City Z
- Ep. 3 · The Obsessive Scientist explores Dr. Genus's dangerous artificial evolution theories and his interest in Saitama.
- Ep. 4 · Saitama intercepts the wealthy Zeniru's bodyguard during a clash with the Paradisers in City F.
- Ep. 5 · Saitama seeks recognition by joining the Hero Association after three years of anonymous hero work.
- Ep. 6 · Saitama struggles to find crime during his first week as a professional hero.
- Ep. 7 · Genos Takes On The Meteor Threatening City Z Alone