James Sharpe

Tom (Aziz Ansari) tries to get back at Ron (Nick Offerman) by going out on a date with Ron's ex-wife Tammy (guest star Megan Mullally), while Leslie (Amy Poehler) tries to protect Ron from falling prey to her charms. Meanwhile, April (Aubrey Plaza) is assigned to work with Chris (Rob Lowe). Rashida Jones, Chris Pratt, Adam Scott, Jim O'Heir and Retta also star.

After a suspected serial killer wakes up from a coma, the BAU reopens the case and uses brain fingerprinting to determine if he really doesn't remember the crimes that had been committed four years earlier in Roanoke, Virginia.

As District 21 is struggling to come to terms with the loss of one of the team they are forced to put their personal feelings aside when a café is bombed. The unit has several suspects and only one good eye-witness, who happens to be a minor. Halstead (Jesse Lee Soffer) pulls some strings to convince the mom to let him question Isabella (guest star Haley Seda) on what she saw. Atwater (LaRoyce Hawkins) finds himself in hot water when he makes a crucial mistake. Thanks to the tech savvy Mouse (guest star Samuel Hunt) the team is able to gain important intel that could help solve the case. Meanwhile Voight (Jason Beghe) helps Platt (Amy Morton) when she comes up against several roadblocks in an attempt to get a memorial stone for their fallen member. Also starring Jon Seda, Sophia Bush, Patrick Flueger, Elias Koteas, Marina Squerciati and Brian Geraghty. Joe Minoso, Markie Post and Kevin J. O'Connor guest star.

In the landmark 100th episode of "Cold Case," the remains of a housewife are discovered in a well. She had made headlines for vanishing on the night of Orson Welles' 1938 radio broadcast of "The War of the Worlds." While the team members work on solving the woman's murder, they learn that her family was trying to outrun the 'aliens.'

Nick represents Dale, a young boy undergoing chemotherapy for leukemia, who's only chance for survival is a bone marrow transplant.