Adolf Hitler My Part in His Downfall is a 1973 film adaptation of the first volume of Spike Milligans autobiography. It starred Jim Dale as the young Terence Spike Milligan. Spike played the part of his father, Leo Milligan.
The film is based on the first volume of Milligans war memoirs. Although it broadly follows Milligans book, some scenes were created specifically for the film and all of the character names apart from the Milligan family are fictional.
Source: Wikipedia