The main feud on the SmackDown! brand was between Brock Lesnar and The Big Show over the WWE Championship. Lesnar won the title at SummerSlam by defeating then-champion The Rock. Two months later at No Mercy, Lesnar defeated The Undertaker in a Hell in a Cell match to retain the title, pinning him after an F-5. On the October 24 episode of "SmackDown!", Big Show was traded to the SmackDown! brand and immediately issued a challenge to Lesnar, who accepted later that night. Later that night, after Lesnar and The Undertaker cut promos to one another, Big Show threw The Undertaker off the stage, thus injuring his neck. On the October 31 episode of "SmackDown!", Lesnar faced off against Rey Mysterio, which ended in a no contest after Big Show interfered and tossed Mysterio into the crowd. Shortly after the match ended, Big Show chokeslammed Lesnar through the announce table. On the November 14 episode of "SmackDown!", Lesnar's manager Paul Heyman was convinced more than anyone that Lesnar could not win, trying to talk him out of defending the title. Lesnar refused and decided to call Big Show to the ring. As Big Show came out, Lesnar drove him through the steel steps. Moments later, Lesnar took out Big Show with five chair shots then nailed him with the championship belt.