Three days after the zombie outbreak, Bill Johnson (Pablo Parés), John West (Berta Muñiz) and Max Giggs (Hernán Sáez) are being chased by a UFO which has locked onto a zombie being carried by John. That ship's tractor beam pulls him into the ship and transforms him (Berta lost a ton of weight between the last movie and this one) all while the team comes up with a plan of turning a zombie into a bomb that will be dragged up into their ship.

Then, each of the group gets split up and has their own stories to deal with. John discovers he has lost his strength after being transformed and must deal with doubt. Bill seeks out renegade agent Jack Taylor (Walter Cornás) to discover how to find the alien mothership. Giggs finds a zombie to be his bomb, but he soon finds himself feeling like a father to the shambling dead thing he calls Junior (Paulo Soria).

In the years since the Plaga Zombie series started, CGI has become more affordable, which makes this movie look way better than the first two movies. Also: all zombie movies may not need a musical number, but seeing as how good the one here is, maybe they should.