Jenna reveals what happened to her and the rest of the gang in the last year—what caused the freeze between Matty and Jenna, what sparked the friendship between Sadie and…

A grisly murder investigation leads Castle and Beckett to a suspect who claims he’s traveled back in time to stop terrible events from unfolding, events that will change the course…

Professor Hickey helps Jeff settle into his new job at Greendale; Abed convinces the study group to take a class focused on Nicolas Cage.