• "Arrow" season 4 premieres on The CW on Oct. 7.

"Arrow" season 4 premieres on The CW on Oct. 7. (Photo : Twitter/CW_Arrow)

"Arrow" star Stephen Amell recently unveiled exciting spoilers for the upcoming fourth season of the hit the CW series in relation to the script, premiere episode and characters Sara and Laurel. 

During a panel discussion at the Las Vegas Comic-Con, Amell said that there is a possibility Sara will try to kill her sister Laurel after she is brought back to life.

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A teaser for the upcoming "Legends of Tomorrow" also showed Sara returning to life after she was tossed into the Lazarus pit. As of late though, it is still not confirmed whether the same footage will be featured in the fourth installment of "Arrow."

Meanwhile, Caity Lotz previously spoke with Cinema Blend to reveal that the effect of being in the Lazarus pit will be worse for Sara because she has been dead for so long.

According to Fashion N Style, there is a possibility that Sara suffered from memory loss and the only thing that she will remember is Laurel stealing her identity. This could then cause Sara to want to kill her own sister.

In other news, Amell also revealed that the filming of "Arrow" season 4 will commence in July. He added that the events in the premiere episode will take place six months after the conclusion of season 3. This is to make room for all of the characters' lives to be explored more in the upcoming season.

As of late, Amell has already started reading the first few parts of the script for season 4 and actor said that there are several shocking moments fans need to watch and see.