Genos vs. Carnage Kabuto

Idiot. Genos vs. Carnage Kabuto was the battle between Genos and the House of Evolution's most powerful creation, Carnage Kabuto.

Prelude
Genos and Saitama arrive at the House of Evolution only for the former to swiftly destroy the building with a massive blast.

Saitama finds a trapdoor which leads to a basment in which they both enter. In the basement, one of Dr. Genus' clones is killed by a chained up Carnage Kabuto. The real Dr. Genus converses with Carnage Kabuto and asks if he could kill Saitama and Genos for him. Carnage Kabuto rushes towards the two and Genos is then "turned into modern art" after Carnage Kabuto punches him into the wall. Kabuto then asks to enter the combat experimentation room and Saitama agrees. In the room, Kabuto then announces to start the killing only to be interrupted by the returning Genos.

Battle
Genos blasts Kabuto in the face with a fire attack that doesn't do anything to the monster. Genos then uses his immense speed and propulsors to run around Kabuto to blast him with fire attacks and attack him with his Machine Gun Blows. While he is initiating his attack, he is swapped away by Kabuto and lands into Saitama's arms. Genos then releases a massive fire attack, but Kabuto blows it back to Genos and Saitama with his breath, taking out Genos. Saitama then takes over the fight for Genos.

Aftermath
Saitama goes to take on Carnage Kabuto after Genos is defeated.