Season 1

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.

Yasmin, Jonny and Hacker are getting into the festive mood. This week's guests include Tom Fletcher and Lindsey Russell. Also including some of CBBC's biggest shows - Danger Mouse, Dennis and Gnasher Unleashed and brand new Odd Squad. And there is more fun and games in 'How many things are in the thing?' and Push Off! (With brand new Odd Squad).

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 are back for more live entertainment. This week's line-up includes stars from The Pets Factor, WWE and Emmerdale. There is another brand new edition of The Next Step and cartoon action from Danger Mouse and Dennis and Gnasher Unleashed. More callers are on the line to guess 'How many things are in the thing?' and find out who will look flushed as they attempt to topple the toilet rolls in Push Off!

Yasmin, Jonny and Hacker are back for more live entertainment. This week's line-up includes DanTDM and Max and Harvey. There is another brand new edition of The Next Step and cartoon action from Danger Mouse and Zig and Zag. Plus more callers are on the line to guess 'How many things are in the thing?' and find out who will look flushed as they attempt to topple the toilet rolls in Push Off!

Yasmin, Jonny and Hacker are back for more live entertainment. This week's line-up includes online stars Lisa and Lena, actor Freddie Fox, magician Dynamo and musician HRVY. Also, the England rugby league team put Hacker through his paces, and there's another brand new edition of The Next Step and cartoon action from Danger Mouse, Ooglies and Zig and Zag.

Yasmin, Jonny and Hacker are back for more live entertainment. This week Pixie Lott, Matt Edmondson and The Next Step stars Shelby Bain and Isaiah Peck, aka Amy and Henry, are in the studio, and Jonny hangs out with a host of vlogging stars. There's also another brand new edition of The Next Step and cartoon action from Danger Mouse and Zig and Zag. And can any of this week's celebrities top the leaderboard when they take on the Push Off challenge?

Yasmin, Jonny and Hacker are back for another morning of live entertainment. This week The Vamps and The Next Step stars Trevor and Isaac (aka James and Eldon) drop in. Camilla Cabello answers questions in Stars Behind Bars and Hacker hangs out with JoJo Siwa. There's another brand new edition of The Next Step, plus cartoon action from Danger Mouse, Ooglies and Zig and Zag. And five more callers get the chance to guess How Many Things Are In The Thing?

Yasmin, Jonny and Hacker return for more live entertainment. Featuring Jim Chapman, New Hope Club and Radio 1's Chris Stark. Meanwhile, Hacker gets his dancing shoes on when he visits the set of Strictly: It Takes Two and meets Zoe Ball. There's the worldwide premiere of a brand new edition of The Next Step, and cartoon action from Danger Mouse, Ooglies and Zig and Zag. More stars take on the tower of toilet roll in Push Off, and another round of How Many Things in the Thing?

Jonny Nelson, Yasmin Evans and Hacker T Dog return for another morning of Saturday Mash-Up! They're joined by stars from CBBC drama The Dumping Ground, and Jermaine Jenas is locked up for Stars Behind Bars. There's a brand new episode of The Next Step, and cartoon action from Danger Mouse and Ooglies. Two more celebrities vie to top the leaderboard in Push Off, and there are more Things in the Thing! Anything can happen on Saturday Mash-Up... except cooking!

Interactive entertainment show presented by Yasmin Evans and Jonny Nelson, with Hacker T Dog. Two more celebrities take on the Push-Off challenge - how many toilet rolls will they land in their trolley? And there's more Things in the Thing. The programme also features another brand new episode of The Next Step, plus cartoon action from Danger Mouse and Ooglies. Hacker T Dog causes trouble with his lie detector, and Coronation Street star Jennie McAlpine is locked up in Stars behind Bars. Plus music from JP Cooper.

This week Extreme Mountain Challenge, Deadly 60 and former Strictly Come Dancing star Steve Backshall will be in the studio, discussing his animal adventures, answering questions from viewers and taking part in some hare-brained games. Steve will take on the fearsome Push Off challenge- but will he avoid a mash-up gunging? Throughout the morning viewers can get involved in the Make Me Viral challenge - who will get the nation talking with their videos? Can you get in touch to guess 'how many things are in the thing?' To top it all there will be cartoon fun with Danger Mouse and a brand new episode of CBBC favourite The Next Step. So stick with Saturday Mash-Up! – the show where anything can happen….except cooking!