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"Steven Moffat has refused to rule out an appearance from Matt Smith in Sherlock. Moffat told Zap2It that while he is wary of &amp;quot;stunt casting&amp;quot;, he is not opposed to the Doctor Who actor joining the hit BBC One detective drama.  Sherlock &amp;#039;The Sign of Three&amp;#039; recap: The end of an era? &amp;quot;Nothing is impossible, but it&amp;#039;s not something we&amp;#039;re particularly striving for,&amp;quot; he explained. &amp;quot;There&amp;#039;s enough inevitable crossover talk between those two, [so] it might be disconcerting for either of [Matt or Benedict Cumberbatch] to appear in the other&amp;#039;s show.&amp;quot; The writer added that he would only cast Smith in Sherlock if there was &amp;quot;a perfect part for him&amp;quot;. &amp;quot;Stunt casting doesn&amp;#039;t work, so it would have to be just because he was overwhelmingly right for it,&amp;quot; Moffat continued. &amp;quot;I love working with Matt. He&amp;#039;s a phenomenal actor. I&amp;#039;d jump at the chance to work with him again. I [just] don&amp;#039;t know how likely that is to be on the set of Sherlock.&amp;#039;&amp;quot;  Smith departed Doctor Who at Christmas and the 31-year-old will be replaced by Peter Capaldi in the sci-fi&amp;#039;s upcoming 2014 run. Sherlock&amp;#039;s third series reaches its climax this Sunday (January 12) at 8.30pm on BBC One. The third series will receive its US premiere on January 19 on BBC America. Sherlock continues with 8.8 million on BBC One Watch a trailer for the Sherlock finale &amp;#039;His Last Vow&amp;#039; below:      "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/sherlock/news/a542394/steven-moffat-on-matt-smith-joining-sherlock-nothing-is-impossible/>