James "Jimmy" Jackson was the father of Ben Jackson.
In February 1942, he was a British soldier stationed in Singapore, where he served under Captain Clive Freeman. His friends in the army referred to him as "Jacko". Jackson helped the Second Doctor defeat the Forsaken, and he and Gibbs were were later rescued by a boat. (AUDIO: The Forsaken)
His son Ben was born in December 1942. (PROSE: Invasion of the Cat-People, AUDIO: The Forsaken)
After the war, he worked on a ship. In 1956, his son Ben was offered a job on board the same ship by the captain. (PROSE: Invasion of the Cat-People)
Before Ben began travelling with the First Doctor in July 1966, James died of a heart attack. (AUDIO: The Yes Men)