Mark Dacascos and  Lacey Schwimmer are next on the jitterbug train. They do a trick-filled performance but there is a fair amount of dancing, too, so it's not only gimmicks. In short: way fun. Carrie Ann shouts woo and does a bunch of fist pumps. She does point out one stumble, though. Len: "Sometimes, less is more, but not in the jitterbug!" Bruno calls it truly spectacular except for one timing loss at the end. Scores:  9-9-8, for a 26/30

Aaron Carter and Karina Smirnoff are hoping the waltz  suits them well enough to stay out of the bottom two. I get kind of distracted by Aaron's ginormous collar, but the performance is quite sweet, actually. Len says he danced with maturity, had a good frame and overall calls it his best dance so far. Bruno says the boy has become a gentleman, but points out a couple of times where he lost his footing. Carrie Ann loves the new, dignified Aaron. Scores: 8-9-8, for a 25/30

Michael Irvin and Anna Demidova  are worried about this week's double elimination while they prepare for the waltz. In the performance, he looks more joyful than you usually see in the waltz, and he seems much more comfortable on the floor than usual. Bruno says this was not a premium waltz even though he was enjoying himself. Carrie Ann questions them about a possible lift but says the performance was charming. Len says he had the best footwork of any of the waltzes tonight -- "it was really, really good!" Scores: 6-8-6, for a 20/30

Kelly Osbourne and Louis Van Amstel work on Kelly's confidence at trapeze school. Their jitterbug is very energetic and tons of fun. Carrie Ann says she brought fun back, but she stumbled a bit and showed when she made mistakes. Len says it was a little flat-footed and was a little disappointing. Bruno says it was cute and nice, but she needs to ignite the performance and sell it. Scores: 7-6-7, for a 20/30.

Louie Vito and Chelsie Hightower try to make up forst last week's lackluster performance by adding lots of tricks and more content. It ... kind of works, at times. Len says parts of it were fantastic, but other bits are ... "grundy(?)." Bruno says he loses his precision. Carrie Ann says she loved it, but he dropped his partner twice, which was not OK. Scores: 7-7-7, 21/30

Joanna Krupa and Derek Hough are back together now that Derek's over the flu. Tom says after it's over that it's the "get a room dance of the season." Bruno: "what a performance!" Carrie Ann says the outside of her lines was good, but she still had hesitation at times. Len says her footwork wasn't too brilliant, but it was still the best waltz of the night. Scores: 8-9-9, for a 26/30.

Donny Osmond and Kym Johnson ramp up their performance with a bunch of tricks for this jitterbug, which seems to play to Donny's strengths (especially goofy fun). Carrie Ann says they know how to work a room, but they had some stumbles and some out of sync moments. Len says it was overall very entertaining. Bruno says at times it was like watching a steam engine trying to keep up with a bullet train. Scores: 8-8-8, for a 24/30.

Last performance of the night is the group mambo, aka the "first ever dance marathon for judges' ranking points." They will get tapped out if they aren't doing well enough. Michael and Anna are out first (2 points), then Louie and Chelsie (3), then Melissa and Mark (4), then Kelly and Louis (5), then Mark and Lacey (6), then Donny and Kym (7), then Aaron and Karina (8), then Mya and Dmitry (9), with the final standing being Joanna and Derek (10).

In danger: Pretty much everyone who got a 20, don't you think?

What did you think about the  episode?