A man's face and body suddenly double in size; an ER physician races to determine why a young woman is burning up from the inside out after a day at the beach; a grumpy old man nearly dies before revealing an emotional secret

Two unidentifiable victims of a car accident are brought into the ER. One of them is a carjacker but which one?

A woman stops eating because she believes she is dead; a runner goes blind in one eye during a marathon and takes a detour to the ER; doctors are baffled by an ER tech's stroke-like symptoms, until someone he loves also becomes ill

A woman believes her neighbors want to kill her; a man is near death after an arrow pierces his chest; two women with swollen abdomens refuse to explain the cause of their pain.