|Tatsumaki vs. Ancient King|
|Outcome||Tatsumaki is victorious|
|Hero Tatsumaki||Monster Ancient King|
|Tatsumaki is uninjured||Ancient King is killed|
|Previous||Saitama vs. Deep Sea King|
|Next||Iaian vs. Melzalgald|
Tatsumaki vs. Ancient King is a short-lived battle that takes place between S-Class hero Tatsumaki and the mysterious being Ancient King.
The Ancient King awakens after 300,000,000 years of slumber. Now that the other "kings" have died, he has awoken to take over the land. Military forces are sent to stop him, but he is left unharmed. The Hero Association deploys Tatsumaki to deal with the Ancient King.
As Tastumaki lands in front of the monster, her phone began to rang. Albeit careless and talking on the phone, she orders the Ancient King to be quiet, as he was introducing himslef. Ancient King shortly converses with her and insult her size. He then tries to stomp her, but she managed to fly away. Tatsumaki then swiftly takes care of Ancient King by bringing down a meteor to smash down on the mosnter, killing him.
Tatsumaki is left without trouble and Ancient King is crushed by the meteor, killing him.