It came down to one last dance on the Dancing With the Stars Season 18 finale: the 24 Hour Fusion Challenge. For this dance, Amy Purdy and Derek Hough had the Argentine Tango and Cha-Cha-Cha.

In their interview with Erin, Derek said it was more like an "hour and a half" challenge, which we guess means they didn't really spend all that much time putting it together. Derek said tonight is more of a celebration than anything else. They're just going to have fun.

In the video package, they looked over pictures from their journey. Amy said it was crazy to think this is their last dance together. It's sad, but it's amazing how many memories they have together. Aww. Lots of tears.

Their dance was pretty cool. Lots of good footwork, and these two styles actually fuse together in a pretty cool way. Nice lifts at the end. Good work for an hour and a half!

Len said she's more than an inspiration; she's a fantastic dancer and that was a fantastic fusion. Bruno said her dancing is up there with the best, and her spirit has been a lesson for America. Carrie Ann could write a novel to her. Every performance is uplifting. Her partnership with Derek has been fantastic.

Score: 30/30.