Mysterious humans from 22nd Century Earth "time-jump" back into the 20th Century to assassinate a high-ranking diplomat on whom the peace of the world depends. The Doctor, Jo Grant, and the Brigadier are soon called in to investigate. Jo is accidentally transported to the future; the Doctor follows, eventually to be captured by his oldest and deadliest enemies: the Daleks! Unabridged. Read by Richard Franklin, who played Captain Mike Yates in the original TV series.