ok, after reading the harry friend or foe thing I have to change my story lol.
Spiderman rejects suit because he almost kills Sandman. ok now, intro Eddie, Eddie goes to church and becomes Venom. Venom goes out to kill Spiderman. LONG FIGHT! Venom fights Spiderman. Sandman joins in and Spiderman starts really losing. Somehow seeing his friend dying, Haryr makes a quick choice even though he has been struggling inside. He puts on the mask... Sandman turns on Venom, Venom bites Sandman, just like the comics. Sandman dies. Harry comes to the scene and him and Peter fight and kill Venom. Harry dies but it was enough to save his friend. Peter goes to Harry and asks why did he save him, and Harry says "Because you're my best friend".
Perfect ending, to a perfect trilogy!