Bruce Beatty

While Meredith faces the repercussions of messing with the medical trial, April tries to step up as chief resident; Cristina and Owen disagree.

Meredith and Derek's relationship concerns Zola's adoption counselor; Alex notices he has become an outcast; Cristina makes a difficult decision.

The team investigates a ransomware attack that disrupts the entire power grid and paralyzes the city; Sam struggles to find a way for his family to celebrate the holidays after his wife's death.

When the boys get tested for STDs, Artie tests positive for a disease and he’s forced to tell his sexual partners. Meanwhile, Kurt and Blaine have relationship issues when Blaine puts on his “freshman fifteen.” Musical performances include "Addicted To Love", "I Want To Know What Love Is", "Let's Wait Awhile", and "Love Is A Battlefield".

A baby's death shakes Lydia to her core; Sammy is questioned about his altercation with Tammi; Cooper seeks solace in Hicks; Ben grows more involved with Brooke while continuing to see Elena.