The Doctor and Donna materialise on Earth , but then it vanishes without trace. Wilf and Sylvia witness the change of sky , as do Sarah and Luke . The Doctor heads to the Shadow Proclaimation , before tracking down the Earth to the Medusa Cascade.

Daleks attack UNIT HQ in New York and Martha uses Project Indigo to escape . Rose watches the Daleks invade Earth . Humans are rounded up by the Daleks and Rose saves Wilf and Sylvia from a Dalek . Martha arrives at her mother's house , and she, Jack and Sarah pick up the Subwave Network from Harriet Jones's home. .

Together they signal the Doctor, who picks up the signal beamed out by Torchwood , and uses it to find Earth one second in the future. The TARDIS materialises on an abandonned street , and Donna points out Rose . The Doctor and Rose run to each other, but a Dalek appears and shoots the Doctor, before it is destroyed by Jack .

Meanwhile, Sarah is confronted by a Dalek patrol ...