David Lengel

A famous graphic artist joins the BAU in their hunt for the serial killer responsible for the brutal deaths of gang members in Los Angeles.

The team look into a series of threats against congresswoman Jenna Flemming; Director Vance takes charge of temporary protection detail.

House and the team treat a high-profile fitness trainer who collapses while shooting an infomercial; Thirteen participates in a clinical trial led by Foreman.

Charlotte faces painful memories of a horrible tragedy; Amelia continues to spin out of control; Addison takes a step closer to motherhood.

Following a tense Thanksgiving dinner that revealed bigger fractures in her and Toby's marriage than they had expected, Kate leaves the Pearson family cabin in order to visit Toby one last time.

Maya is loving the festive season until the presents vanish along with the family car; Ray decides to join a choir but has less than honest motives.