Season 3 of "Arrow" ended with a bang as Oliver finally defeated Ra's al Ghul before riding into the sunset to start a new life with Felicity.

After an intense battle with Ra's al Ghul (Matt Nable), Oliver (Stephen Ammell) managed to take down the leader of the League of Assassins and save Starling City from destruction. Malcolm Merlin (John Barrowman) then stepped up as Ra's successor and become the new head of the League while Thea adopted a new superhero identity as Speedy. In addition, Oliver decided to hang up his hood to drive off in a convertible with Felicity (Emily Bett Rickards), telling her that he had finally found his happiness.

While speaking at MCM London, the show's stars Willa Holland and Karl Yune dropped hints about what fans can expect from their characters in Season 4.

According to Yune, there is a possibility that his character, Maseo, will reappear on the show despite the fact that he was killed by his former wife, Tatsu (Rila Fukushima). Yune revealed that "Arrow" executive producer Marc Guggenheim told him "don't make any plans," reports Screen Rant.

Willa Holland, who plays Thea McQueen on the show, also teased the possiblity of a Speedy storyline and what she wants to see from Speedy.

"For her future in season four man... yeah, I just hope that she keeps wearing that costume as much as possible, and maybe gets a yellow one with a cape or something, I don't know..."

During a recent interview with Flickering Myth, Holland also confirmed that fans should not hold their breaths to see DC Comic supervillain Harley Quinn. Although Harley was featured in a cameo on Season 2 of "Arrow," Holland says that the higher ups at DC Comic blocked the character from appearing on the television series.

Apparently, "Arrow" producers had "big plans for Harley," Holland said. However, those plans were scrapped because the villain will be featured in the upcoming Warner Bros. movie, "Suicide Squad."