Primeval - Season 2 - Eps 4: Underwater Menace
When a boy's disappearance down a drain coincides with an underwater Anomaly, Stephen and the ARC search the local canal for the aquatic predator behind the disappearance, while Cutter is convinced the creature is somewhere else. Cutter turns out to be right in the worst possible way when Abby is taken by Mer Creatures from the future and held captive in a flooded warehouse cellar. Meanwhile, Cutter and Connor learn that there is a conspiracy within the ARC.
About Primeval

Title: Primeval
First Air Date: 2007-02-10
Last Air Date: 2011-06-26
Status: Ended
Rating: 7.4/10 (from 303 votes)
Language: EN
Seasons: 6
Total Episodes: 36
Network: ITV1 U&W
Genres: Sci-Fi & Fantasy, Action & Adventure, Drama
Production Companies: Impossible Pictures, ITV Productions, M6 Films, ProSiebenSat1 Produktion, BBC America
Synopsis
When strange anomalies start to appear all over England, Professor Cutter and his team must track down and capture all sorts of dangerous prehistoric creatures from Earth's distant past and near future.
Cast

Ciarán McMenamin
Matt Anderson

Ben Mansfield
Hilary Becker

Andrew-Lee Potts
Connor Temple

Hannah Spearritt
Abby Maitland

Alexander Siddig
Philip Burton

Ruth Kearney
Jess Parker

Janice Byrne
April Leonard

Ruth Bradley
Emily Merchant

Ben Miller
James Lester