Sea of Souls is a BBC paranormal drama series, recounting the fictional activities of a group of investigators into psychic and other paranormal events. Produced in-house by BBC Scotland and for the final season by Carnival Films, initially in association with Sony Pictures Television International, the series debuted on BBC One in the UK in February 2004. A second series was shown from January 2005, with a third following in 2006 and then a fourth in April 2007. The programme was created by writer David Kane, who also wrote the entire first series. The final series, unlike the previous series, was an independent production for BBC Scotland by Carnival Films. Overview The central character is Douglas Monaghan, played by Bill Paterson, who is the head of a parapsychology unit at a fictional university in Glasgow, Scotland. In the first series he is assisted by Megan Sharma (Archie Panjabi) and Andrew Gemmill (Peter McDonald), but these characters were replaced – without any on-screen explanation – in the second series by Justine McManus (Dawn Steele) and Craig Stevenson (Iain Robertson). The series has seen the team encounter phenomena such as ghosts, reincarnation and voodooism. Each series has consisted of six one-hour episodes, initially comprising three two-part story lines. The first series was shown on consecutive Monday and Tuesday nights, but for series two the transmission days switched to Saturday and Sunday. Other changes introduced in the second series included the introduction of sub-plots to help with the pacing of each storyline, and more Scottish-focused story lines, the first series having been criticised for the characters' frequent trips to London. The third series was broadcast from 7 January – 11 February 2006, each episode airing in a 9.10pm-10.10pm slot. For this third run the format had been changed with the series now consisting of six individual one-episode stories instead of three two-parters, with the episodes being shown once per week on Saturday nights. Executive producer and BBC Scotland Head of Drama Barbara McKissack explained the change in format as being "a much better, faster paced format for this kind of show." Prominent guest stars in individual story lines have included Peter Capaldi, Siobhan Redmond, James Fleet, John Guerrasio, Paul McGann, John Hannah, Jeff Rawle and Colin Salmon. The first two series have been released on DVD in the UK. The programme has also been shown overseas, including in Australia on the Australian Broadcasting