Possible plot hole?

Rating: 10/10 (18 September 2008)

I have a problem. If Harvey Dent burns his face and becomes Two-Face in Dark knight and dies at the end, then how come he is alive in Batman forever? Maybe I am wrong. Please, someone could help me? Is this a plot hole? I believe that the action in Dark knight takes place before the one from Batman forever, because Harvey Dent is still a good person and perfectly normal. The how come if he is dead at the end of Dark knight, he reappears in Batman forever? Dark knight is a good movie, but if I am right, then all I can say is shame for the writers of the script. I hope someone can help me with an answer because i really don't know if I am wrong or I am right.