Jason Bourne
Damon chose not to return for the fourth film, "The Bourne Legacy", which introduces a new main character, Aaron Cross (Jeremy Renner), a Department of Defense operative who runs for his life because of Bourne's actions in "Ultimatum". The character of Jason Bourne does not appear in "Legacy", but mention of his name and pictures of Damon as Bourne are shown throughout the film. Damon returned for the fifth installment, "Jason Bourne".