When Dave starts researching his genealogy, he makes a surprising discovery — he and Calvin are more than just neighbors; Tina offers to help Gemma when she’s overcome with morning…

Patients flood the hospital after gunfire goes off at a parade; a blast from the past throws Maggie off her game on the same day that Meredith tries to talk…

Brennan and her team are brought in to identify the body of a man found in a fallout shelter. While cutting into the bones of the man, Zach accidentally releases…