Episode 3 - The Obsessive Scientist

The narration describes the story of Doctor Genus, brilliant young scientist with ideas of artificially evolving humanity becoming disillusioned with the world, eventually discovering the secret to immortality and creating multiple clones of himself. Saitama cuts off the narration in his impatience and Armored Gorilla then explains that Doctor Genus wants Saitama for his experiments.

Genos and Saitama decide to attack immediately, since the store discount day is the next day. Before they leave, Genos asks Armored Gorilla about any cyborgs active four years ago that have destroyed any towns, which Armored Gorilla states, "I'm the only one."

In preparation for Saitama's arrival, the House of Evolution sets traps in all 8 of the facility's floors and reluctantly decide to release Asura Rhino. Once they arrive, Genos destroys the aboveground facility with a single blast (making all traps ineffective) before heading underground.

The released Asura Rhino (who has killed all of Dr. Genus's clones) fights with Genos, taking no damage in the process. Asura Rhino then faces off against Saitama, but backs off when he detects how powerful Saitama really is. Saitama then reveals to the room his somewhat mundane daily training regime of 100 push-ups, 100 sit-ups, 100 squats and 10 km of running, much to Genos, Asura Rhino and Dr. Genus's disbelief.

When Genos first states it ifs impossible, Asura Rhino then unleashes his Asura Mode and appears to be beating Saitama back, but it transpires that Saitama was just shocked by the realisation that the store discount day was that day instead of the next and defeats Asura Rhino easily, leaving soon after with Genos to catch the rest of the discount day.

Having witnessed this, Doctor Genus abandons his plans of artificial evolution. After the credits, officials from the Heroes Association inspect the House of Evolution blast site and discuss Genos's destructive power.