9 March (production)


 * 1970 - Jon Pertwee signed on for another twenty-five episodes after Inferno: season 8.
 * 1981 - Christopher H. Bidmead was commissioned to write an outline for TV: Castrovalva, the replacement to the recently cancelled Project Zeta Sigma.
 * 2006 - An orchestral score composed by Murray Gold for The Impossible Planet and The Satan Pit was recorded at Air Studios. (DWMSE 14)