7 April 1973: broadcast of first episode of Planet of the Daleks. Jo and the Doctor land on Spiridon and separately encounter a Thal expedition.
7 April 2007: broadcast of The Shakespeare Code. The Doctor and Martha, visiting 1599 London, foil a plot by the Carrionites to invade the Earth via Shakespeare’s plays.
Yeah, this is a good one. I love the Jacobi Master, both in print and on screen, and the Doctor’s dive into the black hole is probably one of my favorite-ever Doctor moments.