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"The producers of Once Upon a Time have hinted at fictional characters that could appear on the show in future. Edward Kitsis told Entertainment Weekly that the fantasy drama&amp;#039;s writers are &amp;quot;waiting for the right moment&amp;quot; to introduce Ariel of The Little Mermaid fame.   &amp;quot;[That character is] already woven into the fabric of what we&amp;#039;re doing; the only question is when,&amp;quot; fellow exec Adam Horowitz added. Horowitz went on to insist that The Wizard of Oz is &amp;quot;another when, not if&amp;quot;, while Kitsis explained that both Robin Hood and Tarzan could &amp;quot;absolutely&amp;quot; appear on Once, while Mary Poppins was also &amp;quot;in-bounds, but it won&amp;#039;t be this year&amp;quot;. The pair also revealed that they had originally planned to feature the character of Sherlock Holmes on the show, but that a &amp;quot;rights issue&amp;quot; had prevented them from writing in Conan Doyle&amp;#039;s famous detective. &amp;quot;But now we&amp;#039;re so in love with the BBC&amp;#039;s Sherlock, I don&amp;#039;t want to even play in that arena,&amp;quot; Kitsis explained. &amp;quot;We&amp;#039;ll never have Sherlock unless Benedict Cumberbatch wants to come on.&amp;quot; Once Upon a Time airs on Sunday nights on ABC in the US and will return to Channel 5 in the UK in early 2013. &amp;gt; Jorge Garcia on Once Upon a Time role: &amp;#039;I&amp;#039;m a dangerous, angry giant&amp;#039; &amp;gt; Once Upon a Time Colin O&amp;#039;Donoghue made series regular Watch the stars of Once Upon a Time discuss their dream characters with Digital Spy below:  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/once-upon-a-time/news/a432430/robin-hood-tarzan-for-once-upon-a-time/>