The CW originally had "big plans" for Harley Quinn in Arrow , according to the series' Thea Queen actress Willa Holland. However, those plans were nixed by DC execs due to the character's involvement in David Ayer's upcoming Suicide Squad movie.

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"We had big plans for Harley. But, I guess something came down from DC execs that told us to shut it down," Holland told Flickering Myth . "I mean we had that tease with the pigtails and the ARGUS outfit but, we’ll never see it. We would love to [have] Harley in Arrow but it will never happen."Harley Quinn first appeared in a Season 2 promo for Arrow, sporting her signature blonde pigtails and an A.R.G.U.S. jumpsuit (seen in the video above). The Batman villain then made a brief appearance in the second season episode "Suicide Squad." While we never saw her face, we do know the voice behind Harley belonged to Tara Strong, who also voices the character in the Batman: Arkham video game series.It sounds like we won't be seeing her again on Arrow, but you can bet there will be plenty of Harley Quinn in Suicide Squad when it hits theaters August 5, 2016. In the meantime, you can find the character in Batman: Arkham Knight, which is set to be released June 23.

Jordan Sirani is a freelance news writer for IGN. You can follow him on Twitter @jdsirani