The H.A.R.D. Corps #27, #28, #29, and #30 (Classic Valiant)

The reason why I don't mind that it's just an issue-long fight scene is partially because of the vast amount of story leading up to this, not only with the previous three parts, but the entire series has been leading to this final confrontation. I also don't mind because this battle is pretty epic and awesome, and because this is the final issue.