to slap the politician who slapped him. >> there was a time when i could have had you shot. >> reporter: and in "guess who's coming to dinner" as dr. john prentice, half of an interracial couple telling his disapproving father times had changed. >> i'm your son. i love you. but you think of yourself as a colored man. i think of myself as a man. >> reporter: in the 70s he's moved from acting to directing. some critics said he played the same role too many times. >> let's get out of here! >> reporter: and as a director, he was a money maker with hits like "stir crazy" and hi buddy movies with bill cosby. >> our whole nation on the brink of disaster. >> reporter: but enduring image is a man, an actor of principle. no surprise he would play mandela, a man whose existence among us made racism let palatable as he noted after receiving a life time achievement oscar.