As the team checks on possible alien activity, they're stopped by a Plumber Magister who accuses them of impersonating Plumbers and orders them not to fight any more aliens until the situation can be sorted out... in a few months. Meanwhile, Darkstar emerges, a new villain who allies himself with the DNAliens to go after Ben and the others.
Now an established part of newly promoted DI Tanika Malik’s crime solving team, retired archaeologist Judith Potts, dog walker Suzie Harris and vicar’s wife Becks Starling are back and bringing their unconventional methods to a string of high-profile murd