Bacterian started the first Bacterian War and sent a fleet to destroy planet Gradius. The fleet was destroyed by a ship named Vic Viper. He sent a second fleet named Salamander and sent another fleet headed by a giant head named Gofer. In the Third Bacterian War, this time, Vic Viper reached the Bacterian's Homeworld and destroyed Bacterian. 400 years later, a piece of Bacterian landed on a planet and transformed it into a fortress. That piece was destroyed by Vic Viper.