12:35The Sarah Jane AdventuresSeries 3Episode 8: The Eternity Trap, Part 2CBBC Duration: 28 minutes Audio described Sat 23rd Jul 2011, 12:35 on CBBC ChannelAvailable for yearsWatch nowChildren's drama featuring an investigative journalist. Sarah Jane and the gang discover the secret of Erasmus Darkening - but are they too late?ContributorsSarah Jane Smith:Elisabeth SladenClyde Langer:Daniel AnthonyRani Chandra:Anjli MohindraProfessor Rivers:Floella BenjaminErasmus Darkening:Donald SumpterLord Marchwood:Callum BlueToby Silverman:Adam GillenElizabeth Marchwood:Amelia ClarksonJoseph Marchwood:Rhys GearDirector:Alice TroughtonProducer:Nikki WilsonWriter:Phil FordMr Scriven:Tony BonczaGenresChildren'sDramaBrandThe Sarah Jane AdventuresSeriesThe Sarah Jane Adventures: Series 3 Source: BBC Online