SN 1 | EP 10 | What Happens in Vegas...Happens

In the season finale of "Heartbeat," Alex fights to save the lives of Jesse, Pierce and Ji-Sung when a mysterious and deadly illness sends the hospital into lockdown. Meanwhile, Millicent must pick up the pieces when Alex disobeys the orders of the CDC, and an elderly man searching for his missing wife leads Alex to make a drastic decision in her love life.

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