Primeval Episode 3.06 Episode 19

Christine Johnson and the military invade the ARC in search of a mysterious artefact they've been investigating.

Danny and the team make a break for freedom and take refuge in a mysterious old hut in the nearby woods.

Here they discover an abandoned experiment from the 1930s. At first they cannot work out what it was about but pretty soon an anomaly appears and it becomes clear what the previous team were studying.

The team - situation goes from bad to worse when a flock of "Terror Birds" - Phorusrhacids - comes through the anomaly.

The team have to use all their ingenuity to keep the ostrich-like killers at bay. For once they have no technology at their disposal, and must rely on nothing more than their bare hands and whatever they can find in the hut, which has not been used since the 1930s.