The Christmas Invasion

The newly regenerated Tenth Doctor takes Rose back to her old estate, and collapses in front of Mickey and Jackie. They take the Doctor to Jackie's flat, where they put him to bed. Mickey and Rose go Christmas shopping, but are attacked by robot Father Christmases using flamethrowers disguised as trombones. The couple get a taxi back to her home where they discover a new, unfamiliar Christmas tree, which starts spinning with razor-sharp blades. Rose, Mickey and Jackie shelter in the comatose Doctor's bedroom. The Doctor wakes up and destroys the homicidal tree with his sonic screwdriver, before again losing consciousness.

Early on Christmas morning, the British-launched Mars space probe Guinevere One is intercepted by a giant spaceship heading for Earth. When the probe's broadcast is shown on Earth, the face of a Sycorax appears. He uses blood control to cause a third of the world's population to go into a hypnotic state and threatens to make these people jump to their deaths from high buildings unless half of the world's population is given to them as slaves. Harriet Jones, the Prime Minister, attempts further negotiations with the Sycorax, and is teleported aboard the ship.