Oti Mabuse drops in to talk about her new show, The Greatest Dancer, but will she avoid the slime? Online stars Marcus and Martinus perform and Art Ninja joins in the fun. Plus Zara Larsson stays back after class in Detention Seekers. There's also Danger Mouse, Odd Squad and all your favourite games including Push Off and Question Slime. Jonny Nelson, Yasmin Evans and Hacker T Dog host.