An evil team has let loose the viruses; beasts that infect a human, concuoring the body and taking control of it. they spread the virus, using their time machine, into the pst, then summoned each virus, with it's infected body, back to them. now, each virus jas a rider belt which they use to cause damage. if the beasts live for long enough, they will give the time machine energy and also they themselves will become more powerful. when the time machine has energy, it will be able to go further into the past. the evil teams goal is to summon an evil beast, who lived at the very beggening of the world but died because of a shatter of meteors, to take over the world. now, team RIDER must destroy the viruses.