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Sir Lenny Henry takes us on a tour of Channel 4 in the 80s, from its launch in 1982 to cult music show "The Tube', improv game show 'Whose Line Is It Anyway?' and blasphemy in 'Brookside".

Vic Reeves takes us on a tour of Channel 4 in the 90s, from the legendary "The Word' and early morning sensation 'The Big Breakfast", to future megastars Ricky Gervais and Sacha Baron Cohen.

Davina McCall gives us a tour of Channel 4 in the Noughties, from outrageous social experiments to the digital-age desire to know every detail about the lives of others.

Jimmy Carr takes us on a tour of Channel 4 in the 2010s, from must-watch reality TV and radical drama, entertainment and comedy, to the nerve-racking experience of a first date.