When several federal government employees, including a close friend of Walker's, succumb to symptoms of a heart attack, the BAU investigates. Also, Reid anxiously awaits his trial date. Jane Lynch guest stars.
Kate wrestles with her feelings following Toby's heart attack; Randall has to get used to his father's relationship with Jesse; Jack and Rebecca must find a home that can accommodate their growing family when they find out they're having triplets.
With the identity of the timeline-unravelling `thread' revealed, the team's mission to protect him at all costs leads each agent to question their own values.
The cast of High School Musical: The Musical: The Series compete against the cast of Never Have I Ever; Ron Funches competes against Meagan Good.