It was a standard Tennant episode, at first. The monster and all that was done pretty well, I thought. Reminded me of Baker/Davison era. But, the end stuff was awesome! I looooooooove it when we see The Doctor's "mad god" persona come to the forefront like that. Total 6th Doctor/Valeyard vibe going there.

"I'm not just fighting the flood! I'm fighting time! AND I'M GONNA WIN!!"

...and...

"...I've gone too far..."

...were some of the best fucking lines Tennant's ever delivered in the role. I truly love seeing this incarnation's hubris and god-complex finally coming around to bite him in the ass.

And did anyone see that preview for the final story? Fuck. Yes. It's on.