Alexander, 49, and Pointless co-host Richard Osman, 48, were joined by four former Strictly Come Dancing professionals and celebrities who had taken part on the show.
Gracing the celebrity special edition of the BBC quiz show today were former contestants Lesley Joseph, 73, Debbie McGee, 60, and former champions Ore Oduba, 33, and Joe McFadden, 43.
Accompanying each star was a professional with AJ Pritchard, 24, Kayta Jones, 30, Giovanni Pernice, 28, and Oti Mabuse, 29, joining the ranks.
As Giovanni and Debbie were knocked out first, Alexander started off the first round by calling out AJ and Katya.
Pull your socks up!
In the first round, both AJ and Katya had failed to secure a low score, with Oti doing significantly better as Alexander explained.
“Oh it was touch and go for every single one of you apart from Oti and Ore,” Alexander began.
“Oti’s our lowest individual scorer there, very well indeed,” the host said, commending the Strictly professional.
“And Oti and Ore, our lowest combined scorers,” the presenter added, before calling out Oti’s fellow professionals.
“Um, but yeah, Katya and AJ, I am just going to say, yes, pull your socks up!” Alexander wanted as the celebrities chuckled away.