"Arrow" Season 4 will feature Deathstroke's return, future Oliver Queen In 'Legends of Tomorrow' and new character deaths within the show.
A new theory for "Arrow" season 4 could reveal the grave of the person that Oliver Queen/Green Arrow (Stephen Amell) cared about six months forward. Recent episodes revealed that Felicity Smoak( Emily Bett Rickards) survives the ambush that Damien Darhk (Neel McDonough) orchestrated in the midseason finale, which resulted to her being paralyzed.
Now that audiences now that Felicity is alive, this does not mean that other major characters of the show could be safe as Felicity's appearance in the grave scene during episode 10 "Blood Debts" could indicate who is the person that was killed this season, ComicBookResources reported.
The first on the list could be Captain Quetin Lance (Paul Blackthorne) due to his betrayal over Damien Darhk. Lance acted as a double agent for Team Arrow, giving them intel and information about Darhk and his organization, H.IV.E. Lance's betrayal could indicate a possible death for him as Blacthorne stated in an interview that character deaths should be "philsophical" and hinted that when his character's time to die comes, he will accept it.
Felicity's mother Donna Smoak (Charlotte Ross) is next in the list of possible deaths as the character has been revealed to have a romantic relationship with Captain Lance. Her connection with the major characters of the show have provided a humanistic side to them, besides their vigilante activities. However, Donna's connection to them will lead her into danger, making her a casualty of war against Darhk. Damien Darhk has been known to come after not just one person, but everyone involved if anyone crosses him.
Another on the list could be Oliver's former girlfriend Samantha Clayton (Anna Hopkins) and her son, William. It was in the second "Arrow" and "The Flash" crossover that Oliver discovered that he is the biological father of William. William's existence could put a strain in Oliver's relationship with Felicity as he is yet to tell her about him. As mentioned before, Darhk will come after everyone that Oliver cares about and Samantha and William's deaths could be the breaking point of his vow not to kill again.
Finally, Laurel Lance/Black Canary (Katie Cassidy) could be in the list due to her affiliation with Team Arrow, not to mention that she is Quentin's daughter. Now that her father betrayed Darhk, the risk in Laurel's life has been increased and if Darhk ever found out who she was and her connection with the Green Arrow, he will not have any problems taking down the heroes for good.
In other news, Amell stated that he wanted Slade Wilson/Deathstroke (Manu Bennett) back in season 4 during the "Heroes and Villains" Fan Fest in New Jersey. The "TMNT 2" star pointed out that having Deathstroke in the show could provide the missing piece within the show and stated that Bennett's character was a transformative figure.
Slade Wilson was last scene in A.R.G.U.S. maximum prison in the island of Lian Yu and was the main the villain in season 2.
Amell added that Oliver Queen could also appear in an episode of "Legends of Tomorrow" titled "Star City 2046" as a future version of himself.
Executive Producer Marc Guggenheim told Entertainment Weekly that the episode will feature a older version of Oliver sporting his famous goatee and a missing arm similar to Mark Miller's famous comic book storyline "Batman: The Dark Knight Returns". Guggenheim added that Conor Hawke will also be featured in the said episode.
"Arrow" season 4 returns on Wednesdays at 8/7pm central on the CW Network.