Sheldon is overexuberant that Leonard finally has a girlfriend matching his high standards.

Robert and Ray end up with the mother of all guilt trips when they decide not to help Marie with a home project so they can land a prime spot on the golf course. Their overnight wait in the car for a tee time becomes a brawl over their respective roles in their parents' future.

Charlie and Joey break up, and Rachel finally tells Joey about her crush on him. He decides nothing can happen because Ross is a good friend, but after he sees Ross and Charlie kissing, he heads back up to Rachel's room where the two kiss and shut the door. Meanwhile, Monica and Mike compete at a game of ping pong.

Peyton tells Sloane that she has made a deal for the Rambaldi Sphere with an ally in China. Sloane arranges for stolen missiles to be sent to Hong Kong. Sloane's plan is revealed to the APO members, who race to stop him before he can use the Rambaldi Sphere to put the plan in motion. But this all leads to a long awaited confrontation between Sydney and Irina.

Location: London, Earth Date: 7 November, 1987 Enemy: The Reapers Rose requests a trip back to the day her father, Pete Tyler, died. Reluctantly, the Doctor agrees, but he realises he has made a mistake, when Rose saves Pete from being run over by a car. This has now changed the timeline, and Reapers are transposing themselves all over the Universe. However, this time, the Doctor doesn't have a plan…