Primeval

Primeval is a sci-fi drama of 45-minute episodes which is aired in many countries. A number of actors have appeared in Primeval but only 3 have been in every episode. Andrew Lee Potts (Ideal), Hannah Spearritt (Blessed) and Ben Miller (The Worst Week Of My Life, Moving Wallpaper, The Armstrong & Miller Show, two of the better Doc Martin episodes). Also in many episodes are Juliet Aubrey (Middlemarch, Criminal Justice, Five Daughters) and Lucy Brown.
ITV dropped the program following Series 3 due to not having the money to produce it. With some cash inflow from BBC America, the German broadcaster Pro7, and UKTV Watch, a fourth and fifth series were produced with Series 4 concluding last night and Series 5 is scheduled to start broadcasting in May.
http://en.wikipedia.org/wiki/Primeval