the movies are based on the video game with the first title which first appeared on 1985
ok now the story:
Resident evil
A military corporation called umbrella was promising a biological weapon which would help alot in war the T-virus this virus can mutate people after death and they continue to live but they are not intelligent anymore and they think only to feed so everybody in a high tech facility called The hive were infected so the main computer called The red queen kills them and closes the doors but now some marines must go and destroy the computer but then the red queen releases the zombies and they all die except two of them Alice and Matt
Resident evil apocalypse
6 months have passed since the death of the marines in the hive now a director of umbrella orders to open the hive but the zombies get out and attack the city.Now umbrella has a new weapon more deadly then the others:Nemesis he is Matt who was survived from the hive but now mutated he is transformed into a monster very powerful that he is very difficult to be killed but at the end nemesis becomes a good guy and saves the others so they can escape from the city.