Continuing the story from Episode 4. Downing Street announces mankind’s first Interplanetary War, but the real danger is much closer to home. When the Doctor, Rose and Harriet Jones race against time to unmask the villainous Slitheen, Rose’s mum and boyfriend hold the key to salvation. Can the missiles be stopped?
The body of a medical researcher is found in the river, and Davies realizes it's more than suicide.
While Maggie is doing everything possible to sabotage her romance with a handsome African-American actor, Andy is badgered into having dinner with a fellow middle-aged extra whose dour company he despises.
Damning evidence is found about Detective Inspector Adrian Fell. Is he a ruthless killer? And what is the sinister secret he is trying to keep hidden?