I am a fan of this film series it should be known, accepting it for madhouse style horror themed action set pieces and little else. That being said this movie is utter RUBBISH. The plot is shitty for a Resident Evil film and far stupider than any of the games. AVOID.
I would call this a spoiler, except you can't spoil this. Loads of old dead charters are brought back because everyone is a clone, and Wesker is brought back without any explanation.