Alison Ward

A male patient who seems to have a hysterical pregnancy fascinates the staff.

Nash and Joe trail a renowned assassin who comes to San Francisco to kill an FBI special agent; Lisa discovers her divorce from Nash was never finalized.

Nash must stop a sniper shooting victims at random; Evan proposes to Cassidy,who after a serious traffic accident, is left fighting for her life.

Nash is out of action after Caitlin accidentally shoots him in the butt; Cassidy is stalked by a deranged college student.

The unit faces permanent closure; Caitlin plans to leave; Nash and Jake Cage (Steve Austin) compete for Caitlin.

Nash and the SIU take a pregnant teen run-away into protective custody after she claims to witness a gangland massacre; Joe and Nick try to cheat the IRS by "donating" Mr. Woody to a Hasidic summer camp.