This page is meant to catalog all major events in the One-Punch Man universe in chronological order.
|Before the series|
|Date||Fights, Battles & Events||Image|
21 Years Prior
|Tatsumaki is sent off to be tested because of her extraordinary powers.|
20 Years Prior
|Boros and the Dark Matter Thieves begin their journey to planet Earth after receiving a prophecy stating that they will find a worthy opponent for Boros there.|
18 Years Prior
|Tatsumaki is saved by Blast.|
13 Years Prior
| Saitama enters Middle School and is beaten by Piggy Bancon.|
Mumen Rider attends the same school and is beaten by some delinquents.
12 Years Prior
|15 years old Superalloy Darkshine begins his daily lifting training after receiving weights for his birthday.|
11 Years Prior
|Gouketsu wins the first Super Fight tournament.|
10 Years Prior
|Zombieman escapes from the House of Evolution.|
|At most 7 years ago||Psykos looks into the future. Psykos experiments with Mysterious Beings.|
4 Years Prior
|Genos' town and family are destroyed by a mad cyborg.|
Dr. Kuseno saves Genos, and transforms him into a cyborg.
3 Years Prior
|Saitama saves a young child from Crablante which began his childhood goal of becoming a hero, and begins his training.|
Sometime after the event, Agoni founded the Hero Association.
2.5 Years Prior
|S-Class is created.|
2 Years Prior
|Elder Centipede is defeated by Blast.|
|Saitama's 300th day of training||Saitama defeats Himawari, and later Personification Of A Light Pull Cord.|
|More than 1.5 years prior||Saitama defeats Octopus Claw Man and saves King.|
|More than 1.5 years prior|| Saitama's hair begins to fall out.|
170,000-Year Magicicada Nymph attacks Z-City, but is killed by Saitama.
|More than 1 year prior||Metal Bat is promoted to S-Class, and receives his signature metal bat.|
|Less than One Year Prior||Garou beats up and incapacitates his fellow disciples and is promptly expelled from Bang's dojo.|
|Six Months Prior||Garou steals the identity of Wolfman, and uses his identity to win the Super Fight Tournament.|
His victory earns him the attention of Suiryu, a famous martial artist and previous 4-time winner of Super Fight.
|Less than One month Prior||Homeless Emperor obtains his powers from God.|
|Date||Fights, Battles & Events||Image|
|Present|| Saitama has now become a powerful hero for fun, capable of killing monsters in one punch. Saitama saves cities from Vaccine Man, Marugori, Super Custom YO649Z Mk. II and the Subterranean King.
B-City is destroyed.
|Next Day|| Saitama meets Genos, saving him from Mosquito Girl.|
Dr. Genus orders his minions to bring Saitama to the House of Evolution.
|1 Week Later|| Genos begins his tutelage under Saitama's guide. Soon after, Saitama's apartment is attacked.|
The duo infiltrate the House of Evolution's headquarters and combat Carnage Kabuto and destroy him. Dr. Genus' life is positively changed after Saitama's actions.
|1 Day Later|| Hammerhead and the Paradise Group begin their attack, but are defeated by Speed-o'-Sound Sonic and Saitama.|
Saitama meets Sonic and defeats him.
|1 to 2 Days Later|| Saitama and Genos attend the Hero Association exam and pass. Genos becomes an S-Class hero, while Saitama becomes a C-Class hero.|
Sneck attempts to fight Saitama but is defeated.
Genos and Saitama spar and Saitama is overwhelmingly victorious.
|7 Days Later||Saitama encounters Speed-o'-Sound Sonic during his search for a criminal in order to accomplish his weekly hero quota. Saitama quickly dispatches him and is promoted to C-Class rank 342.|
Golden Ball and Spring Mustache are sent to investigate Z-City's ghost town, where they encounter Kombu Infinity who defeats them.
|Unknown||A giant meteor heads towards Z-City. S-Class hero Metal Knight and Genos fail to stop it, but Saitama manages to shatter the meteor, though he is unable to prevent collateral damage to the city.|
|3 Days Later||Tanktop Tiger and Tanktop Black Hole accuse Saitama of taking credit for the S-Class heroes' role in destroying the meteor, and challenge him to a battle.|
|Several days after||Deep Sea King and his Seafolk begin their invasion of the surface world, starting with J-City, many heroes failed to defeat the Deep Sea King|
Sonic and S-Class hero Puri-Puri-Prisoner escape prison, and encounter the Deep Sea King.
|Hours Later||The Deep Sea King finds the shelter and later fights Genos and defeats him.|
Mumen Rider arrives to stop the Sea King, and gives a speech acknowledging his lack of power.
Saitama defeats the Sea King with ease and pretended to be a cheat in order to rally support for the defeat heroes, which worsened his reputation.
|1 Day Later||Saitama is promoted to Rank 1 in C-Class and then decides to move up to B-Class. He now has to start from the bottom of B-Class Rank 101.|
|Unknown||Shibabawa foresees a great tragedy that will result in the Earth's destruction. She develops a coughing fit and dies choking on a cough drop she swallowed.|
Saitama is promoted to B-Class Rank 63.
|Unknown||All S-Class heroes are called to the Hero Association for an emergency meeting. All the S-Class heroes except Blast and Metal Knight show up to the meeting where it is revealed by Sitch that the earth is in great danger.|
|Boros and the Dark Matter Thieves arrive to A-City, destroying it.|
Iaian loses his left arm against Melzalgald.
Melzalgald is killed by the combined efforts of Metal Bat, Puri-Puri-Prisoner, Atomic Samurai, and Silver Fang.
|Saitama confronts the leader of the Dark Matter Thieves, Lord Boros and they began to fight.|
Boros uses "Collapsing Star Roaring Cannon" to destroy the planet, but Saitama counters the attack killing Boros.
|1 Day Later||Tanktop Master trains to prove his strength can compete with Tornado of Terror's psychic powers. After being humiliated by Metal Knight, Tanktop Master trains to surpass Metal Knight's machinery as well as Tatsumaki's psychic powers.|
|1 Week Later||Metal Knight rebuilds A-City and turns it into an unbreakable fortress.|
The monster Pluton attacks Y-City and Z-City, but is destroyed by Saitama.
|Unknown||G4 attacks King, but King runs away and Genos fights in his place. King is revealed to be a fraud and inadvertently took credit for defeating 5 monsters that Saitama defeated.|
|Unknown||Sitch holds a meeting in an attempt to recruit criminals to help deal with the monster uprisings. Garou attends this meeting, defeats three heroes and all of the criminals there declares his hero hunt.|
Blizzard of Hell tries to convince Saitama into joining the Blizzard Group, but fails.
Speed-o'-Sound Sonic fights Genos to a draw.
Garou defeats Mumen Rider, the Tank Topper Army, Charanko, Golden Ball and Spring Mustache on his hero hunt.
|Unknown||Saitama decides to join the Super Fight Tournament under Charanko's name.|
Garou attacks Saitama, who he believes to be a hero searching for him and is defeated.
|1 Day Later||Metal Bat is assigned to protect Narinki and his son Waganma from Garou. He confronts 4 Demon level threats and defeats them.|
|Hours Later||Elder Centipede attacks S-City and Metal Bat attempts to stop him, but ends up fighting Garou. Meanwhile the Monster Association begin their invasion.|
Metal Knight arrives in
an attempt to defeat Elder Centipede but fails. The monsters kidnap Waganma.
|Hours Later||The Super Fight tournament begins, with Saitama being in the semi-finals along with Volten, Choze and Suiryu. Genos eliminated all the monsters in C-City, but was defeated by Gouketsu.|
|Hours Later||Do-S encounters Blizzard of Hell and the Blizzard Group|
Do-s' uses Fubuki to draw out Tornado of Terror.
|Hours Later||Child Emperor and Pig God fight Eyesight.|
Drive Knight goes around killing monsters and interrogates one for info about the monster invasion.
Garou fights Watchdog Man.
|Hours Later||Flashy Flash fights Hundred-Eyes Octopus, but Tornado of Terror intervened and killed it.|
Atomic Samurai and his students decide to strike the Monster Association.
Saitama came into the finals of the Super Fight, where his disguise was blown and is disqualified.
Gouketsu traps all the Martial Artist and holds the Super Fight Stadium hostage.
Rosie is killed by Choze.
|Minutes Later||Suiryu defeats Choze, Benpatsu, Hamukichi and Volten.
Gouketsu smashes Suiryu into the ground.
Bakuzan is transformed into a monster and pummels Suiryu.
Nyan transforms several prisoners into monsters.
Saitama kills Bakuzan and Gouketsu.
Garou attempts to fight King but is defeated by Saitama.
|Hours Later||Drive Knight enters Z-city and loses contact with Hero Association staff.|
|Unknown||Sonic receives an invitation for the Monster Association from Hellfire Flame and Gale Wind. Sonic eats a Monster Cell but fails to transform.|
|1 Day Later||Death Gatling leads an ambush with Stinger, Smile Man, Chain'n'toad, Wild Horn, Glasses, Shooter and Gun Gun against Garou.
Genos confronts Elder Centipede and ultimately loses.
King draws away Elder Centipede and Saitama kills Elder Centipede.
|Hours Later||G5 captures Narinki's Private Squad and tells Gyoro Gyoro that he was sent by The Organization.
Monster ruling parade occurs. Garou dine and dashes.
Tareo is kidnapped by the monsters.
|Hours Later||Royal Ripper and Bug God report to Gyoro Gyoro on Garou.|
|Next Day||Garou infiltrates Monster Association and kills any scouting monster.|
|Minutes Later||Garou and Tareo encounter and escape Overgrown Rover. Garou battles Showerhead, Unihorn and Super Mouse. All three monsters are killed when they anger Overgrown Rover.
Garou battles Overgrown Rover and is sent to the bottom floor where Gyoro Gyoro resides.
Gyoro Gyoro explains her experiments into Mysterious Beings. Garou battles Orochi and is completely overwhelmed.
|Hours Later||Sweet Mask masks interrupts the S-Class meeting and antagonizes Flashy Flash, Tornado of Terror and Zombieman. King arrives to the meeting.
Saitama is exploring the tunnels of the Monster Association's base.
|Minutes Later||The heroes strike team arrive at the Ghost town of Z-City to confront the Monster Association. They battle and kill various monsters including Evil Eye and Rhino Wrestler.
After watching the battle, Gyoro Gyoro calls a meeting with the Monster Association's cadres.
|Minutes Later||Sweet Mask, the S-Class heroes and Kamikaze's disciples all head into different entrances of the Monster Association's headquarters.|
Child Emperor and Waganma run into G5 but safely retreat from him.
Phoenix Man is defeated.
Okamaitachi, Iaian and Bushidrill encounter Do-S and the mind controlled Narinki's Private Squad. They battle and Sweet Mask interrupts the fight letting the swordsmen go. Sweet Mask kills Narinki's Private Squad.
- In the Original Webcomic, Saitama became a professional hero 65 days ago. In 43 days Saitama became a B-Class hero and is currently 2 days in A-Class.
- Approximate timeline of Saitama's promotions:
- Week 1: C-Rank 388 (Saitama registers as a hero)
- Week 2: C-Rank 342 (Post Sonic)
- Week 2: C-Rank 5 (Post Giant meteor)
- Week 3: C-Rank 2 (Pre-Seafolk invasion), then C-Class Rank 1 (After Deep Sea King incident)
- Week 4: B-Rank 101 (Promotion)
- Week 5: B-Rank 63 (At S-Class meeting)
- Week 6: B-Rank 7 (When Fubuki visited Saitama)
- Currently in Week 7-8