Bang, Bomb, and Fubuki vs. Overgrown Rover is the battle between Bang, Bomb, and Fubuki and the Monster Association executive Overgrown Rover.
Prelude
After retreating from Saitama during his fight with Orochi, Overgrown Rover continues to wander the Monster Association headquarters, until he comes across Bang, Bomb, and Fubuki.
Battle
Rover fires energy blasts at Bang, Bomb, and Fubuki. Fubuki shields them with a psychic barrier. While he's attacking them, Psykos telepathically communicates with Overgrown Rover and orders him to attack Tatsumaki.