What could have been...
Season 2 of Arrow featured a cameo by Harley Quinn played by Cassidy Alexa, with the deleted scene (watch below) featuring Tara Strong's voice as well.
Now while appearing at the MCM London Comic-Con this weekend, Willa Holland, who plays Thea Queen, let it be known big things were planned for Harley Quinn in Arrow.
“We had big plans for Harley," Willa Holland revealed, reports Flickering Myth. "But, I guess something came down from DC execs that told us to shut it down. 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.”
Obviously, what came down was Harley Quinn being a member of David Ayer's Suicide Squad movie, which is what happened with Arrow's version of Deadshot as well. Arrow EP Marc Guggenheim revealed a couple of months ago that Deadshot was off the table.
That's not the only character the WB execs axed - originally, Brandon Routh's Atom was going to be Blue Beetle, but WB said no to using Blue Beetle and suggested Atom.
It will be interesting to see what happens when The Flash movie gets going.
Arrow Harley Quinn deleted scene:
Cassidy Alexa as Harley Quinn: