Claudette Mink

Peter, Walter, Olivia and Broyles pursue a strange and deadly occurrence in Philadelphia where a bomb blew up inside a train station but left no trace of any explosive device. The perplexing and unexplained set of circumstances returns Walter to the lab to closely examine the human remains where he uncovers an unlikely energy source that triggered the explosion. With the explosive threat of more bombs and links to a classified military project, the intense investigation leads Olivia and Peter to Iraq.

After Lex is accused of killing a young woman, Clark sets out to prove his innocence and asks an unlikely source for help--Lionel. Swearing he is a changed man, Lionel offers Clark insight into the crime, but he asks for something in return. Meanwhile, Lana meets Jason's parents and has a vivid flashback of the incident in Paris when she got her tattoo. Lana suspects that Jason's mother, Genevieve (recurring guest star Jane Seymour - "Dr. Quinn, Medicine Woman," "Somewhere in Time"), was present when Lana got tattooed.

After Air Force One is shot down in the desert, Jack's only hope of keeping the "nuclear football" out of the hands of the terrorists comes from two campers who saw the plane go down.

After Dylan and Rommie go to Arazia to get the tribunal to sign the Commonwealth Charter, Dylan is sentenced to life in prison.

Christine (Shelley Fabares) consults a specialist when Hayden's (Craig T. Nelson) energy and sex-drive come to a halt.