A London bus takes a detour to an alien world, but can the Doctor defeat the Swarm?
DI Alex Drake wakes up in 1981. With Gene Hunt's help, can she find out who shot her in 2008?
Tom has a job interview; Tom plans to learn more about the Derbyshire branch of his family tree; Pete must perform a procedure on an alpaca at the zoo; Tom is determined to learn about a family secret.