Actor Stephen Amell arrives at the 2014 People's Choice Awards in Los Angeles, California January 8, 2014
Actor Stephen Amell arrives at the 2014 People's Choice Awards in Los Angeles, California January 8, 2014. REUTERS

"Arrow" Season 3 spoilers include DC Comics villains gracing the show in the first few episodes of the hit series on The CW. The showrunners are not announcing Harley Quinn, but the mere sighting of her hair in pigtails in Season 2 has thrilled many fans. In an interview with International Business Times Australia, Cassidy Alexa thanks the show's followers for their support. Fans, even Stephen Amell, hope to see the character back in Arrow 3.

Spoiler alert: This feature contains Arrow Season 3 spoilers. Read only if you want to know some of the latest scoop in TV entertainment.

Stephen Amell, Oliver Queen aka The Arrow himself, has previously responded to a Harley Quinn question on Facebook: Story here. Amell, who has been proud of how Arrow Season 2 focused on several tough and proud female DC Comics characters, would like to have Harley Quinn again in Season 3.

Show boss Marc Guggenheim, however, had earlier told Collider he "did not expect people to lose their minds the way they did" after catching their "Easter Egg." Still, fans are hoping the show bosses would have Harley Quinn again in Arrow Season 3. His fellow show boss Andrew Kreisberg, after all, anticipated the fans' excitement.

Asked how she felt upon witnessing the fans' collective reaction to her brief screen presence as Harley Quinn in Arrow Season 2, Cassidy Alexa told IBT Australia:

"The fans' reaction has been beyond my wildest dreams. Wow. I have wept reading some of the comments and messages I have received. Never in my life have I felt such kindness, and friendship. Thank you all so much. From the bottom of my heart, I absolutely adore you."

Michael Rowe, who plays DC Comics' Deadshot on Arrow Seasons 1 and 2, posted this photo on Instagram, confirming - when only rumours were swirling at the time - that Cassidy Alexa was the girl in pigtails in Arrow 2x16: "Suicide Squad."

Cassidy Alexa won the role of Harley Quinn, many fans on Twitter are convinced. Below is a petition calling for her return to the superhero series.

Cassidy Alexa as #HarleyQuinn on #Arrow #Season 3 http://t.co/xKYMaluIbY via @ipetitions Sign this petition please! #TeamQuinner

— ☆ Harℒow Quinn (@HappyLow_) August 4, 2014

Meanwhile, John Barrowman becomes a series regular as Malcolm Merlyn, aka Dark Archer in Arrow Season 3. There are speculations that he would turn his daughter Thea (Willa Holland) into a villain. Also joining the next season is Superman actor Brandon Routh, taking the role of Ray Palmer, aka The Atom.

The possibility that Ra's al Ghul is the main villain of Arrow Season 3 has been hinted at a video teaser released during the San Diego Comic Con 2014. (Scroll down to play the video.) Most recently, Matt Ward ("Tron: Legacy") has been cast as Simon Lacroix, aka Komodo, according to Entertainment Weekly.

WATCH: Arrow Season 3 Spoilers, Teasers feat. Ra's Al Ghul (Comic-Con Trailer)

Arrow Season 3 premieres Oct. 8 on The CW.

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