Zombie 3 (1988)
When a terrorists body, infected with a stolen chemical, is cremated by the US military, a virus is unintentionally released into the atmosphere over a small island
Rats: Night of Terror (1984)
In a post apocalyptic earth, where most of humanity lives underground, a group of surface people stumble upon an abandoned lab that was trying to bring life back to the earths surface, but the place is run over by vicious rats