The Curse of Cygnus was the name given by Vargas to a sickness which briefly afflicted all humans arriving on the planet Cygnus Alpha. The cause of the sickness was unknown.

Left to itself the sickness passed off harmlessly after a short time, but Vargas was able to use it as a means of control. Each new consignment of prisoners sent to Cygnus Alpha would fall ill and be 'treated' by Vargas with a unique drug which only he had access to (in reality the drug was simply chalk). Vargas claimed that the Curse of Cygnus would return and prove ultimately fatal, unless sufferers took the drug regularly - with loyalty and obedience to Vargas the price of receiving it. (A: Cygnus Alpha)