ABC | 10:00 pm
Almost any holiday can motivate people to go a little crazy (OK, maybe not Arbor Day), but the most dangerous day of the year actually is Valentine’s Day, maybe because there’s such a thin line between love and hate. That puts the police team on high alert in a new holiday-themed episode called "Heartbreak." As for their off-duty hours, the newly single Officer Nolan (Nathan Fillion) invites everyone over to his place for a party. Alyssa Diaz, Richard T. Jones and Melissa O’Neil also star.