VIPER is a supplement in which the VIPER organization is detailed.
Reception
Sean Holland reviewed VIPER in White Wolf #37, rating it a 4 out of 5 and stated that "If you are a Champions games master, get this book! It is the best overview of a global criminal agency yet published. Even if you don't use VIPER in your campaign, the material can be easilyadapted to other villainousagencies. If you are a game master of another superhero system, I recommend that you take a close look at the VIPER sourcebook for the reasons mentioned above. This is the sourcebook for a villainous agency in a superheroic world. Don't letthe boss in green down."