The Enemy Within Revisited.
The classic campaign for Warhammer Fantasy Roleplay 1st Edition gets a revisit as The Order of Chaos Gamers use 3rd edition rules to tackle arguably the best RPG campaign ever written.
The Apothecary's brush with Skaven pushes him to the edge of insanity while one member of the party keeps a watchful eye (or three) on mutant events. WFRP, Actual Play