I haven't seen Chud I, but suspect I won't lose much there. The Chud research project is being terminated, thankfully there is extensive exposition. It was an enzyme creating zombies - of course. I should've known. But one has escaped. Chud on the loose. Chud be gone.
We've cut to a science class, with a class prankster, which by a bizarre and largely unexplainable series of events, has caused a cadaver to run away on a gurney down the street. To solve this the lads are going to find a replacement. Confused?
Chud the Bud goes for a wander around town, converting people to his way of life. Rich Hall (of QI, Whose Line is it Anyway, various BBC comedies/tourism things) makes a brief appearance as a barbers client. While the army continues to look for the Chuds, the Chuds continue to look for beef. There are flame throwers, explosives, lots of wins! Bud also falls for the hero's girlfriend.