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Stop it, no spitting flames. Where are your manners? Sit!
— Saitama disciplining Rover.

Saitama vs. Overgrown Rover and Nyan was the brief fight between the B-Class hero Saitama and the Monster Association executives Overgrown Rover and Nyan.


While continuing his patrol through the Monster Association Headquarters, Saitama comes across Overgrown Rover. He contemplates what could have allowed a dog to grow so large.


Saitama retaliates against Rover

Rover growls angrily at Saitama, then fires an energy beam at him. Saitama jumps over the beam, calling Rover a "bad dog" and remarking at his lack of training, before jumping and launching a punch, which sends Rover flying.

Saitama's punch deals massive collateral damage, destroying a very large area of the Monster Association base. The shockwaves are large enough to be felt across the entire base, and are noticed by hero and monster alike. Sekingar wonders if the act is a sign of an unexpected party joining the conflict, while Genos realizes it could only be the work of Saitama.

Nyan uses Super Feline Retribution against Saitama

Nyan, having witnessed the encounter, is shocked upon realizing Saitama's abnormal strength. He takes advantage of Saitama's unawareness and launches a sneak attack, scratching the back of Saitama's head several times with his Super Feline Retribution. However, Saitama is completely unfazed, turning around and remarking at the absurdity of encountering a monster dog and cat at the same time. A terrified Nyan flees the scene, deciding to leave Saitama to the other monsters.


Gyoro Gyoro contemplates the event, believing Rover's defeat to be an impossibility, but is cut short by the timely arrival of Tatsumaki.


  • Nyan's interference is manga exclusive, although the majority of the battle with Rover is identical to the webcomic.


Monster Association Arc
Manga Chapters 78798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154
Manga Volumes
Webcomic Chapters 53 • 54 • 55 • 56 • 57 • 58 • 59 • 60 • 61 • 62 • 63 • 64 • 65 • 66 • 67 • 68 • 69 • 70 • 71 • 72 • 73 • 74 • 75 • 76 • 77 • 78 • 79 • 80 • 81 • 82 • 83 • 84 • 85 • 86 • 87 • 88 • 89 • 90 • 91 • 92 • 93 • 94
Fights Garou vs. Death Gatling's GroupGarou vs. GenosGarou vs. Bang and BombGenos, Bang and Bomb vs. Elder CentipedeKing and Saitama vs. Elder CentipedeGarou vs. Royal Ripper and Bug GodGarou vs. Royal RipperGarou vs. Unihorn, Showerhead and Super MouseGarou vs. Overgrown RoverGarou vs. Gyoro GyoroGarou vs. OrochiTatsumaki vs. Evil EyeHeroes vs. Rhino WrestlerFlashy Flash vs. Gale Wind and Hellfire FlameChild Emperor vs. Phoenix ManChild Emperor vs. Sludge JellyfishChild Emperor vs. G5Child Emperor vs. Phoenix Man: Round 2Zombieman vs. PurebloodPig God vs. The Great Food TubAtomic Samurai's Disciples vs. Do-S and Narinki's Private SquadSweet Mask vs. Do-S and Narinki's Private SquadAtomic Samurai's Disciples vs. Devil Long HairPuri-Puri Prisoner vs. BaqumaPuri-Puri Prisoner vs. Prisoners of Smelly Lid PrisonPuri-Puri Prisoner vs. NyanSuperalloy Darkshine vs. Bug GodSaitama vs. Overgrown Rover and NyanTatsumaki vs. PsykosSaitama vs. OrochiAtomic Samurai vs. G5Atomic Samurai vs. Black SpermZombieman vs. Homeless EmperorSweet Mask vs. Fuhrer UglyPig God vs. GumsAtomic Samurai's Disciples vs. Evil Natural WaterGarou vs. Puri-Puri PrisonerHeroes vs. NyanDrive Knight vs. NyanGenos vs. G5Garou vs. Superalloy DarkshineChild Emperor vs. Evil Natural WaterBang, Bomb, and Fubuki vs. Overgrown RoverTatsumaki vs. Psykos & OrochiHeroes vs. Psykos and OrochiHeroes vs. Monster Association ExecutivesGarou vs. BombGarou vs. Bang