10th September 1966: broadcast of first episode of The Smugglers, starting the original Season 4. Polly and Ben are astonished to discover that the Tardis is more than a police box, and incredulous at being transported to the late eighteenth century. The local churchwarden gives them a cryptic message and is promptly murdered; Ben and Polly are arrested by the locals, and the Doctor captured by pirates.
10th September 1977: broadcast of episode 2 of Horror of Fang Rock. The shipwreck survivors reach the lighthouse, but an unseen presence is stalking them...
10th September 1993: radio broadcast of episode 3 of The Paradise of Death. The Doctor, Sarah, Jeremy and the Brigadier reach the planet Parakon and are embroiled in a power struggle over agriculture (no, really).
10th September 2008: radio broadcast of Lost Souls (Torchwood). As the Large Hadron Collider at CERN gears up for opening, the Torchwood crew and Martha are summoned to Geneva to investigate mysterious goings-on.