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Channel 4's roving newshound, Underdog, has returned in a new campaign to explain the broadcaster's public-service remit and what sets it apart.

This time, Underdog has secured his own chat show with celebrity guests discussing their experiences at Channel 4. Guests include stars such as Ashley Walters, Derren Brown, Jon Snow, Michaela Coel, Alan Carr, Anne-Marie Duff and Rob Delaney. The ad was created by Jolyon White and Richard Biggs at 4Creative, and directed by Neil Gorringe. Underdog first debuted last year amid uncertainty over the channel's privatisation.