The third series of The Sarah Jane Adventures will continue today with the second part of The Eternity Trap. The synopsis for today's episode reads: Sarah Jane and the gang discover the secrets of Erasmus Darkening, in the second and concluding part of The Eternity Trap, but are they too late? As ghosts from the past rise up, and the quest to find the missing children reaches a climax, it seems that nothing can stop the ancient alchemist's rise to victory. Sarah Jane Smith is played by Elisabeth Sladen, Professor Rivers by Floella Benjamin and Erasmus Darkening by Donald Sumpter. 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. Part two of The Eternity Trap will air today, Friday the sixth of November, at 4:35pm on BBC One. It will also air in higher definition on BBC HD at the same time. The third series of The Sarah Jane Adventures will then continue with Mona Lisa's Revenge next Thursday and Friday. It will star Elisabeth, Thomas, Daniel and Anjli. It will air both days at 4:35pm on BBC One and BBC HD. Mona Lisa's Revenge will be the second to last story from this year's new series.