<P> Ryan learns from the radiation assessment team that the isotopic signature from the nuclear blast pinpoints it as having been manufactured at the Savannah River Site in South Carolina in 1968; evidence which seems to exonerate the Russians . In Syria, Clark tracks down Ghazi, one of the men who found the bomb, now dying of radiation exposure . He tells Clark that he sold the bomb to Olson, who lives in Damascus . Ryan's colleagues at Langley infiltrate Olson's computer and download files that implicate Dressler as the person who bought the plutonium and who is behind the Baltimore attack . </P> <P> Ryan is able to reach the National Military Command Center in The Pentagon and get a message to Nemerov, saying that he knows that Russia was not behind the attack, while also asking Nemerov to stand down his forces as a show of good faith . Nemerov agrees to do so as President Fowler follows suit . The participants in the conspiracy, including Dressler, are assassinated . Presidents Fowler and Nemerov announce new measures to counter nuclear proliferation in joint speeches at the White House, as Ryan and his fiancee Dr. Catherine Muller listen in . </P> <Ul> <Li> Ben Affleck as Jack Ryan </Li> <Li> Morgan Freeman as William Cabot, Director of the Central Intelligence Agency </Li> <Li> Bridget Moynahan as Dr. Catherine "Cathy" Muller </Li> <Li> James Cromwell as J. Robert Fowler, President of the United States </Li> <Li> Liev Schreiber as John Clark </Li> <Li> Michael Byrne as Anatoly Grushkov / Spinnaker, senior advisor to President Nemerov . </Li> <Li> Colm Feore as Olson </Li> <Li> Alan Bates as Richard Dressler </Li> <Li> Ron Rifkin as Sidney Owens, Secretary of State </Li> <Li> Ciarán Hinds as Alexander Nemerov, President of the Russian Federation </Li> <Li> Bruce McGill as Gene Revell, National Security Advisor </Li> <Li> Richard Marner as President Zorkin, President of the Russian Federation prior to Nemerov </Li> <Li> Philip Baker Hall as David Becker, Secretary of Defense </Li> <Li> Josef Sommer as Senator Jessup </Li> <Li> Ken Jenkins as Admiral Pollack </Li> <Li> Philip Akin as General Wilkes </Li> <Li> John Beasley as General Lasseter, Chairman of the Joint Chiefs of Staff </Li> <Li> Lee Garlington as Mary Pat Foley, CIA </Li> <Li> Joel Bissonnette as Mason, Dressler's American contact </Li> <Li> Sven - Ole Thorsen as Haft, Dressler's hitman </Li> <Li> Aleksandr Belyavsky as Admiral Ivanov </Li> <Li> Lev Prygunov as General Saratkin </Li> <Li> Yevgeni Lazarev as General Dubinin </Li> <Li> Gregory Hlady as Milinov </Li> </Ul> <Li> Ben Affleck as Jack Ryan </Li>

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