Noah Emmerich - most recently seen on White Collar and a movie veteran of such films as Miracle and The Truman Show - guest stars on this Sunday's season finale of The Walking Dead.

The actor will play a physician that lets survivors into the Center for Disease Control and reveals... well, see for yourself. The following clip is courtesy of "TS-19," the final installment of this great AMC series until at least the summer of 2011.

Watch, enjoy and check out our detailed review of the most recent episode HERE.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.