The Sparticle Mystery is a returning British science fiction television series written and created by Alison Hume and produced by Sparticles Productions for CBBC. The series follows a group of ten children within modern Britain, where an experiment at a Large Hadron Collider-like facility, named the Sparticle Project, goes wrong, sending all persons aged 15 and over into a parallel dimension at exactly 11:11am. The children travel to the Sparticle Project in attempt to bring back the adults and re-align the two dimensions. The series, which had a budget of £3 million, was filmed in and around Bristol, with the final episode filmed at the ISIS neutron source particle accelerators, near Didcot. Series 2 has been extremely popular with over 2 million hits on BBC iPlayer to date. In general, the series has received mixed to positive reception, with a score of 7.3 on IMDb. The programme, which stars Annette Badland as Doomsday Dora/Holodora, has similar themes to both Lord of the Flies and the Gone series, and has many similarities to The Tribe; however, it is noted for its difference in that the children desire to bring back the adults.