The third series of The Sarah Jane Adventures will continue today with the first part of The Eternity Trap. The synopsis for today's episode reads: A haunted house, with mysterious whispers and secrets in the shadows attracts Sarah Jane's attention in the first of a new, two-part adventure, written by Phil Ford and directed by Alice Troughton. When Professor Rivers and the gang investigate an old legend, a monstrous creature appears in the night as the terrifying grasp of Erasmus Darkening reaches out from centuries past. The Eternity Trap features Elisabeth Sladen as Sarah Jane Smith alongside Thomas Knight as Luke Smith, Daniel Anthony as Clyde Langer and Anjli Mohindra as Rani Chandra. The episode also sees Floella Benjamin return as Professor Rivers, who has previously starred in The Lost Boy and The Day of the Clown. Part one of The Eternity Trap will air today, Thursday the fifth of November, at 4:35pm on BBC One. It will also air in higher definition on BBC HD at the same time. The episode will then conclude tomorrow at 4:35pm with part two of The Eternity Trap. Then, next Thursday and Friday, Elisabeth, Thomas, Daniel and Anjli star in Mona Lisa's Revenge on BBC One and HD.