Sacha Baron Cohen has made a searing return to the small screen with his satirical comedy series Who Is America? which has garnered some passionate endorsements from a host of stars.

The 46-year-old London-born comedian, who is best known for his comedy characters such as Ali G, Bruno and Borat, has been secretly filming the seven-episode series for the past year and the show debuted on Showtime in the US on Sunday (July 15).

Baron Cohen went undercover using prosthetics and make-up as different characters while interviewing a series of American political figures such as Sarah Palin, Bernie Sanders and Dick Cheney.

The first episode saw the comedian dress up as a former Israeli army colonel, Erran Morad, who convinces several gun lobbyists to lend their support to his 'Kinder-Guardians' project which aims to protect children from gun-violence in school by arming kids aged 4 to 12.

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The reaction to the show has been predictably polarizing on Twitter, but many high-profile names have gotten behind the show.

Actor Russell Crowe tweeted that the series is "breath taking", Get Out director Jordan Peele said it's "essential" viewing, Judd Apatow told his followers "you must see this", while actress Courteney Cox said it's "the best comedy of the year with incredible social commentary".

The first episode of Who Is America? airs on Channel 4 at 10pm on Monday July 16.