Our first ever celebrity guest is behind the Mystery Door and who better than the king of YouTube himself, it's KSI!

Ahead of his first series as a full time judge on Britain's Got Talent, KSI pops in for a chat. Things rapidly descend into chaos after the boys take on a head to head challenge - warning: Dec gets punchy...

We'll be back on Thursday, but until then, keep your correspondence coming to [email protected]

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00:00 - Welcome to the Hang Out

03:53 - This week’s Mystery guest is KSI!

05:24 - Getting to know KSI

06:39 - Ant & Dec to join the Sidemen?

07:30 - KSI shares advice on how to go viral

10:30 - This years Britain’s Got Talent is the best yet!

11:20 - Simon Cowell never repeats his critiques

14:35 - KSI’s first Boxing match

18:00 - ‘Who’s comment is it?’

25:25 - Ant’s wears KSI’s bandana

27:00 - Ant vs KSI vs Dec Boxing

28:50 - Ant is on the floor

29:40 - Dec’s turn

30:30 - KSI loves getting punched

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