Karl T. Wright

Bailey treats a young mother battling breast cancer, Derek learns more about Mark and Addison's relationship, the interns defend a resident's competence at a hospital staff meeting, and Meredith and Addison examine a couple who find themselves in a rather awkward position.

When NASA reschedules Howard's mission and puts his wedding plans in jeopardy, he's forced to face his fears and Bernadette's dad (guest star CASEY SANDER). Meanwhile, Leonard says something surprising to Penny in the bedroom.

The agents are called in to investigate the murder of a convict who served nine years for rape and murder, but was recently released on DNA evidence.

Paul Young stands in the way of Susan getting her much-needed kidney transplant and Lynette is furious with Tom when he passes up a lucrative job opportunity in order to continue working with Carlos out of friendship.

The BAU are called in to investigate when a wealthy couple are murdered in their home following a Super Bowl party.

"A" instructs the girls each to perform a specific task or Dr. Sullivan will be killed; Emily is lured into a deadly situation.