The Ultimate Enemy

Normally I would be more inclined to favour the more light-hearted episodes and this is not one of them. That said it's extraordinarily well done.

The evil future version of Danny Phantom is wonderfully portrayed (that's not a spoiler, it's revealed in the first scene).

Clockwork has a magnificent plan and is an extraordinarily memorable antagonist.

Solzhenitsyn once said that the line diving good and evil runs through every human heart. And while this episode, of course, isn't the Gulag Archipelago it does handle the theme well.

Tucker:Name one evil thing that Danny has done Clockwork:Shows the moral conflict of the episode (which spoilers:Includes Danny making a bad decision) Tucker:Name Two Clockwork:How about two thousand

And a character previously depicted as extremely villainous ends up becoming more complicated a figure.

The drama of the episode of quite compelling and the story of Danny Fenton/Danny Phantom becoming evil Danny Phantom is a magnificent character study.

I didn't love the ending of Reign Storm, which was another excellent episode, but with this one even I'm not going to nitpick for flaws.

I will warn you that it has a darker tone than most Danny Phantom episodes.