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LOOK OUT, ROSS

Film actor Dermot Mulroney (My Best Friend's Wedding) has signed on to do three episodes of Friends playing an office rival of Rachel's (Jennifer Aniston). His first episode airs in January. Dick Van Dyke, meanwhile, will appear in the Jan. 23 episode of Scrubs as a long-time friend of Dr. Kelso's (Ken Jenkins).

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Film actor Dermot Mulroney (My Best Friend's Wedding) has signed on to do three episodes of Friends playing an office rival of Rachel's (Jennifer Aniston). His first episode airs in January. Dick Van Dyke, meanwhile, will appear in the Jan. 23 episode of Scrubs as a long-time friend of Dr. Kelso's (Ken Jenkins).