After the CyberMasters take a young child off a bullet train in space, the Doctor and Yaz discover a rogue planet near Earth in 1916 that harbors an unimaginable secret. While a pair of companions from the Doctor's past join with U.N.I.T., a Dalek spy offers to overthrow the Dalek race.
U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.
