Primeval

Evolutionary zoologist Nick Cutter discovers that unexplained anomalies are ripping holes in the fabric of time, allowing creatures from the very earliest stages of Earth's development to roam the modern world. Cutter and his team struggle to keep the looming disaster secret while dealing with savage dinosaurs which threaten Humanity. Cutter also has to deal with a deeply personal dilemma, when his wife Helen, who has been missing and presumed dead for years, returns from travelling in the past with possible answers to the riddle of the anomalies. But is it an answer she is willing to share?