The Phantom Virus is the central antagonist of Scooby-Doo franchise’s 9th animated feature film Scooby-Doo and the Cyber Chase.
He is a menacing virtual virus ghost. During the final level which is in a carnival, the Virus assembles Creeper, Jaguaro, Gator Ghoul, Tar Monster, and Old Ironface (old enemies from Mystery Inc.'s past) to destroy the Mystery gang until the Virus is destroyed when Scooby grabs the last box of Scooby Snacks, along with the monsters he assembled. It turns out that a student at a university named Bill McLemore made the virus because his baseball video game project was not picked by Professor Kaufman, so he exacted revenge on the Professor and his assistant Eric Staufer (who's video game design was chosen) by creating the Phantom Virus. Bill ends up getting foiled and arrested. 
Trivia[]
He Also Resmbles The Smoke.