Randall uncovers new truths about his past; Kevin and Randall struggle to reconcile their differences.
Callen must interrogate his father after he is found in a patient's hospital room during a radiation poisoning case; members of the team discuss their plans for Thanksgiving.
As the members of team Scorpion try to save lost hikers, their helicopter crashes, injuring the pilot and igniting a wildfire.
Leonard is forced to face some insecurities when his case leads him to consider right and wrong. Meanwhile, Sandra takes on Seth, who files charges against a comic.