Four movies have been produced based on Clancy novels featuring Jack Ryan, starring three different actors as Ryan:
* The Hunt for Red October (1990) ? Alec Baldwin
* Patriot Games (1992) ? Harrison Ford
* Clear and Present Danger (1994) ? Harrison Ford
* The Sum of All Fears (2002) ? Ben Affleck
The chronology of the movies was altered from the novels. The film adaptation of Patriot Games is a sequel to The Hunt for Red October, rather than a prequel, with the Ryan role recast. Also, while the novel The Sum of All Fears takes place after Clear and Present Danger, the film takes place earlier in Ryan's career.
The Sum of All Fears is not part of the Baldwin/Ford trilogy, but rather an intended reboot of the franchise. The discrepancy can be seen in the fact that he meets John Clark for the first time in Clear and Present Danger and the Clark character is significantly different; Ryan is also married in the first three films.