HD PREMIERE The Fifteenth Doctor decides it's time to figure out Ruby's origin, and with UNIT he investigates his suspicion of Susan Triad, instead discovering that he has been traveling with an ancient evil for most of his lifetime, in "The Legend of Ruby Sunday." Doctor: Ncuti Gatwa. Ruby: Millie Gibson. Carla: Michelle Greenidge. Kate: Jemma Redgrave. Rose: Yasmin Finney. Ibrahim: Alexander Devrient. Mel: Bonnie Langford. Morris: Lenny Rush..
