ER (1994–2009)
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Chaos Theory 

Dr. Carter, Abby and other staff of the ER are quarantined as the CDC investigate a mysterious, deadly outbreak.



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Episode cast overview, first billed only:
Jing-Mei Chen (as Ming-Na)


After a young girl is brought into the ER with a potentially serious and highly communicable disease, the Centre for Disease Control orders the entire hospital to be evacuated. Everyone that is except the staff who came into contact with her including John Carter, Abby Lockhart, Pratt and Jing-Mei Chen who will have to spend two weeks quarantined in the ER. Abby and Carter start a relationship. While evacuating patients by helicopter, Dr. Romano has a serious accident. Elizabeth Corday has returned to London to work in her father's hospital but is finding it difficult to adjust to her new environment. Written by garykmcd

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Drama | Romance





Release Date:

26 September 2002 (USA)  »

Filming Locations:


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Aspect Ratio:

1.78 : 1
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Did You Know?


The first season without two of the original cast, Eriq La Salle and Anthony Edwards. See more »


When we first see Romano fall to the ground after his arm is chopped off, Goran Visnjic is already looking up at him in the background. But when we see Goran in close up, he is only just looking up from his patient. See more »


Dr. Gregory Pratt: To tell you the truth, I don't know if I could date a chick that was missing pieces.
Dr. John Carter: What if she had a really great personality?
Dr. Gregory Pratt: What, and really big tits?
See more »

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User Reviews

Chaos Theory (#9.1)
9 April 2015 | by (Canada) – See all my reviews

Well that was some eventful episode! I knew we will start with the quarantine where last season ended, but didn't realize it would be such a big issue. They have shown issues in Africa, things happening in a German University working on figuring out what the virus is. And evacuated the whole hospital.

The only ones who stayed were the ones who had to be quarantined. And they ended up spending there two weeks! This was actually the fun part. Pratt and carter playing soccer and breaking a window was very fun. And at the en Weaver asking Pratt to work the day he got released was a good joke too.

But the evacuation was very dramatic and indeed chaotic. There was a real tragedy when Romano had his hand chopped off by a helicopter. Man that scene was shocking. I am worried for him, hope they will be able to save it, at lest he is alive.

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