Sci Fi Channel in July will kick off a third season of Doctor Who with the Christmas special The Runaway Bride, guest-starring Catherine Tate. The first official episode of the new cycle, "Smith and Jones," will then introduce viewers to David Tennant's new gal Friday, Martha Jones (played by Freema Agyeman). Exec producer Russell T. Davies promises "new thrills, new laughs and some terrifying new aliens," including visits from Plasmavores (bloodsucking ETs), the Judoon (a clan of stormtroopers) and William Shakespeare (subject of many a CliffsNotes guide).