Boos are a species of ghost enemies from Super Mario Bros franchise. Boos follow Mario once his back is turned, but cover their eyes when he looks at them. Boos make a minor appearance in Worst Hero And Villain War Ever.
Worst Hero And Villain War Ever
Attacking the Pac
Koopalings Morton and Wendy create a group of Boos to attack Pacman and his wife Pepper with. As Pacman runs away from them, he bumps into a truck full of Power Pellets, and gains Pac Power. Light created from Pac Power ends up blinding the Boos and causing them to vanish.