Ioan Gruffud looks great in spandex as Mr Fantastic in Fantastic Four. But he looks equally handsome in 18th-Century clothes in Amazing Grace, the most powerful drama of the week.

Ioan (pronounced Yo-an) plays William Wilberforce, the English parliamentarian who fought for two decades to abolish the slave trade in his country. William was a son of a wealthy merchant who had graduated from Cambridge. After he experienced a religious conversion, he became convinced that the enslavement of black people was wrong.

William soon became a key figure in the "abolition movement" (a movement to abolish the slave trade) and mounted a tireless campaign to educate Englishmen on the evils of the institution. He battled serious illness and charges of sedition to make his case — and find romance along the way with an equally passionate abolitionist (Romola Garai).

Ioan Gurffud endows his character with fiery determination and boundless charisma, making William Wilberforce a truly amazing and extraordinary man. Director Michael Apted (Gorillas in the Mist, The World is Not Enough) does not shy away from laying out the finer points of the abolitionist arguments, which at times hints at the political hypocrisies of Western governments (namely America and Britain) today.

A must-see for political LGBTs and anyone else who passionately believes in freedom and justice.