Yasmin, Jonny and Hacker are back for more live entertainment. This week's line-up includes Matt Terry, Chris and Xand from Operation Ouch, Lauren Layfield from The Dengineers and the series finale of The Next Step. Plus an exciting live outside broadcast - will Chris and Xand make it from the hospital to the Mash-Up studio on time? Jonny meets some Mash-Up viewers in hospitals around the country, Sam Quek is the Star Behind Bars, and there is more fun and games in 'How many things are in the thing?' and Push Off!

Yasmin, Jonny and Hacker welcome a host of stars into the studio for their live Christmas party. Plus we crown one celebrity the Push Off Champion for 2017! Plus some of CBBC's biggest shows - Danger Mouse, Dennis and Gnasher Unleashed and brand new Odd Squad. And there's more Things in the Thing and a look at some of the best bits from the series.