La Fosse du diable

Goku locates Roshi and Bulma in their capsule ship. Goku collects Roshi and Bulma in a careless manner then makes the ship swerve down and aggressive Launch takes control in the nick of time. Yamcha's hearing the invisible man works out at first until Baba starts singing awfully. Yamcha takes repetitive blows. Krillin diverts the invisible man with applause giving Yamcha the chance to fight back, but the invisible man becomes silent and starts devastating Yamcha. Goku arrives with Roshi and Bulma. With a thrust of Bulma's breasts, Krillin causes Roshi to have a violent nosebleed right on the invisible man, exposing him to Yamcha. Yamcha beats the invisible man with a Wolf Fang Fist, making him surrender. Roshi reveals that Baba is his sister. For the next fight, Baba leads the whole lot into her creepy tower. Yamcha is to fight in a realm called "The Devil's Toilet". Baba takes Goku to her home room, serving him a meal while testing his reflexes. Baba has creepy ideas in store for Goku and his friends.  (Source: Wikipedia)