When a truth-seeking monster arrives in Mystic Falls during Commonwealth Day, Hope and Lizzie fear that the secrets they've each been keeping have made them targets. Meanwhile, MG, Kaleb and Kym seek out an unlikely ally, who may have knowledge on how to take down the latest monster. Finally, Freya receives an unexpected visit from one of the Salvatore Students.

Hope joins forces with an unlikely ally to take down a Christmas monster, who's using holiday cheer to infiltrate the Salvatore School. Elsewhere, Landon surprises Rafael with news about his family lineage, and Sebastian accompanies Lizzie on her latest mission.