Primeval is a live-action TV drama set in modern England. The premise of the show is that strange holes in time and space, called 'anomalies', are randomly popping up, and creatures from the past and future are coming through. A team of randomly thrown-together people is tasked with finding the anomalies and making sure anything that comes through goes back.
Like many other shows, Primeval is driven by the interactions between its characters, so fics where they are OOC are Not Good At All. It should also be noted that despite the time travel, no dead characters have been brought back, and some even got wiped from existence by accident, so reviving the dead is a charge.