Scott Allen Rinker

Marshall and Lily enter a Halloween costume party, and Robin brings her new boyfriend. Ted and Barney go to the same fancy dress party they go to every year when Ted waits for his lost love.

While investigating a case where bodies are found in the middle of the woods, the team discover that the suspects have created a new sport.

When Derek witnesses a horrible car accident, he springs into action in an attempt to save the lives of those involved.

House treats a young married couple with similar symptoms, but they are shocked by the cause of the illness; a walk-in patient stands up to House.

Brennan and Booth investigate their colleagues when an intern's remains are found in an incinerator; Booth poses as Cam's boyfriend and accompanies her on a family get-together.

Mark interrogates Hellinger to determine when the next blackout will occur; Demetri must decide whether to turn Simon over to the FBI or accompany him in his attempt to prevent the upcoming flashforward.