Ryu and Ken decide to go to Thailand in hopes of learning Muay Thai. Once at Bangkok airport, Ashura's boss Donu plants some heroine in Ryu's backpack, who is then arrested and sent to prison. Here he endures brutal torture from Warden Nuchi and taunting from other prisoners, eventually coming to confront Sagat, a disgraced Muay Thai champion. Meanwhile, Ken does what he can to free Ryu from prison.
