Spoiler Summary [Click to show or hide]:
OPM Manga Chapter 33 shows us the first encounter between Saitama and Boros.
Boros immediately acknowledges Saitama’s immeasurable strength while the heroes below are busy dealing with one monster.
Saitama infiltrates an alien space shuttle, accidentally removing an entire room while trying to open a door. Meanwhile, Metal Bat, Bang, and Puri-Puri Prisoner fight off the monster Melzargard.
Despite Melzargard’s attempts to regenerate, Metal Bat discovers a weakness that looks like a marble and destroys it. It immediately destroys one of Melzargard’s bodies.
Inside the ship, a map is revealed, and starts zooming into its intricate parts. It focuses on a person in the middle of a fleshy pathway. The 3D map reveals Saitama standing in the middle.
As voices in his head urged him to surrender, Saitama tricks the aliens by running in the opposite direction. He then jumps and destroys a huge door.
He encounters Boros on a stage, powers up, and faces off against him. A black monster named Geluganship appears, using telekinesis to throw rocks at Saitama.
Geluganship wonders if he has hit Saitama, who remains unfazed with his iconic bored face.