It is being speculated that Batman super villain Harley Quinn will be part of the Suicide Squad in episode 16, season 2 of Arrow.

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In the 30-second preview for the episode, also called Suicide Squad, introduced fans to the dangerous team.

A team member who is not clearly visible to us is seen as part of the team in the teaser and online blogs like Screen Rush are suggesting it might be none other than DC's iconic villain Quinn.

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Behind the prison cell bars, a blonde whose back is faced to the camera, wearing her hair in loosely-tied pigtails, is seen, and she is being picked as being one of the usual suspects. Quinn has been included in DC comics Suicide Squad as well and Arrow has featured Batman characters in the past.

The clip essentially amps up the fear factor.

"We've been tracking death stroke, find him," one of the Arrow team members is heard saying. The threat is asserted as one of the other members -- "you can't go there by yourself, it's suicide" -- warns about heading into the squad cell.

The suicidal gang is shown dressed in yellow jump suits and the leader of the pack, who wears a black eye patch, is seen welcoming the Arrow team members.

The synopsis of the episode, called Suicide Squad, suggests the Slade Oliver feud will be dragged on for a while. Oliver will have to prepare to combat his former friend who has sworn to destroy Oliver and his family.

The synopsis also reveals that Diggle will be helping Amanda and A.R.G.U.S. to take on a warlord from Afghanistan, but he will end up finding himself in a sticky situation.

Here's the official synopsis:

"Following Slade's (Manu Bennett) return and his promise to make good on his threat to destroy Oliver's (Stephen Amell) loved ones, Oliver focuses all his energy on preparing for battle with his former friend. Sarah (Caity Lotz) tries to help but, fearing for her safety, Oliver pushes her away. Meanwhile, Diggle (David Ramsey) is recruited by Amanda Waller (guest star Cynthia Addai-Robinson) and A.R.G.U.S. to stop a warlord (guest star Lee Majdoub) he knew from his time in Afghanistan. Always the soldier, Diggle agrees to help. However, he's not prepared when Amanda introduces him to the rest of the team -- Deadshot (guest star Michael Rowe), Bronze Tiger (guest star Michael Jai White) and Shrapnel (guest star Sen Maher), all criminals he and Arrow helped put away. Lyle (guest star Audrey Marie Anderson) defends the team and explains the world is a complicated place, but Diggle isn't sure he agrees. When the mission takes a dangerous turn, Diggle is forced to make a difficult decision."

Suicide Squad will air on March 19 at 8 p.m. on the CW.

Watch the promo for episode 16: