As Rose Tyler embarks upon her first big TARDIS adventure with the newly-regenerated Doctor, they discover a sinister hospital run by strange cat people and run in to two old acquaintances, The Face of Boe and Cassandra.

The Eleventh Doctor is portrayed by Matt Smith. Steven Moffat took over as head writer and executive producer after Russell T Davies stepped down. Julie Gardner also stepped down as executive producer and was replaced by Piers Wenger and Beth Willis.