The Monsignor takes an unlikely convert under his wing. Lana secures a new piece of evidence that can exonerate Kit. Dr. Arden witnesses a miraculous return.

Oliver discovers that after he and his father went missing, Moira and Thea stopped celebrating Christmas. Determined to make up for lost time and restore a sense of normalcy to the Queen household, Oliver decides to throw the family a Christmas party. Meanwhile, Tommy asks Laurel to spend Christmas with him but she points out that Christmas was also her sister Sara’s birthday and she needs to be with her father. Tommy suggests changing things up might be the best way for everyone to heal but Laurel isn’t sure her father is ready for that.

After he's injured in a terrible fire at an auto machine shop, Jose Vargas is forced to go on disability and leave his life as a firefighter behind - a task he finds incredibly difficult. Chief Boden tries to help a suspected teenage firebug. Also, Severide receives an enticing invitation from Renee, a woman who he saved from a car crash incident involving live electrical wires. Meanwhile, Cruz tries to save his younger brother Leon from the gang he is involved with.

The BAU heads south to investigate a fast-moving UnSub whose signature matches that of a serial killer from 30 years ago. Also, the team learns that someone is tracking their cases and replicating crimes the BAU is solving.

When five people are killed in a small plane crash a mile off the Vegas strip, the CSI team is called to investigate. Also, Sara feels the strain of having a long-distance relationship with Grissom when a former lover of hers is involved with the crash investigation

From "Parental Guidance," actor Billy Crystal; photographer James Balog; musical guests Grizzly Bear

When Manny and Luke’s Little League team makes it to the playoffs, Claire and Cameron search for a field to use; Gloria uses a microphone to sing to the baby.

"America Again" defeats Papa Bear's bestseller, Jeff Bingaman gives Stephen a Senate how-to, Fox News attacks the 9/11 site mosque, and Mandy Patinkin talks national security.

From "This Is 40", actor Chris O'Dowd; from "2 Broke Girls", actress Beth Behrs.

Frankie worries Mike is tiring of her as their 20th anniversary draws close; Sue tries to get Axl and Brick's help planning a party for their parents; Axl spoils the end of a book for Brick.

The chefs' ability to share is put to the test when their genealogy inspires dishes. Later, they must cater a homecoming party for celebrity couple Anna Faris and Chris Pratt. Rick Moonen is the guest judge.