Saturday Mash-Up! LiveSeries 4Episode 21CBBCFirst broadcast: Sat 2nd Oct 2021, 09:00 on CBBC ChannelLatest broadcast: Sat 2nd Oct 2021, 09:00 on CBBC HDCartoon fun with Ninja Express and Boy Girl Dog Cat Mouse Cheese. Plus an episode of Odd Squad.GenresChildren'sEntertainment & ComedyBrandSaturday Mash-Up! LiveSeriesSaturday Mash-Up! Live: Series 4 Source: BBC Online