Pirates of the Caribbean star Johnny Depp will present a brand new documentary about his hero, artist Ralph Steadman.

Steadman is best known for his illustrations for the books of American author and Gonzo journalist Hunter S. Thompson, who was another idol and close friend of Depp's before he passed away in 2005.

The Sky Atlantic documentary is titled For No Good Reason and will air next year. It is the first in a series that will see guest stars presenting the channel's Documentary Films Season.

Also lined up to present is The Fog of War Oscar-winning director Errol Morris who will look at the role of US Secretary of Defence Donald Rumsfeld in the Iraq War.

Morris' documentary, The Unknown Known, was the first to be nominated for the Venice Film Festival's Golden Lion award in September.