Arrow star Stephen Amell previews Deathstroke's return

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Thursday night's episode of Arrow, "Deathstroke Returns," kicks off a two-part search for Deathstroke's son Joseph. The question is, can Slade be trusted? Is this all some sort of elaborate trap?

To say there is bad blood between Oliver Queen and Slade Wilson, aka Deathstroke, would be an understatement. Oliver's former mentor-turned-mortal enemy once injected himself with the Mirakuru serum, which enhanced his physical prowess but screwed with his mental stability. Consequently, a rage-fueled Slade amassed an army for an all-out assault on Star City.

However, Slade's most unforgivable offense came when he murdered Oliver and Thea's mother, Moira, in front of their eyes. Oliver and friends ultimately defeated Slade and locked him up in an A.R.G.U.S facility located on the island of Lian Yu.

However, a desperate Oliver later recruited Slade to help rescue his son, William, from the clutches of Prometheus. Slade left shortly after those events. Now, Deathstroke has enlisted Oliver to find his own teen son.

So, what's the deal?

On the Vancouver set of Arrow, leading man Stephen Amell spoke with SYFY WIRE and previewed what viewers can expect from Oliver and Slade's strained relationship and their adventure together.

"Manu Bennett and I worked on where they are," Amell said. "I thought the early drafts of the script almost slipped them back into what you would have seen in Season 1, the latter part of Season 1, or maybe even the early part of Season 2 back on the island. Oliver understands perfectly well that Slade was under the influence of something. He was not in his right mind. With that being said, certain things cannot be undone. Ever. Do I trust him when he is in his right mind? Yes. Do I rely on him? Sure. Are we going for a beer after our road trip to go find his son? Probably no. Probably not. There are certain things that I cannot forgive. I think that at his core, Oliver thinks that Slade is a good person.

"We leave this two-part episode fairly open-ended," Amell concluded. "It's great having Manu back. Both of these episodes, they really are his episodes. Between what is going on with Slade in the flashbacks – which continue in episode six – and the ongoing storyline surrounding Vigilante and what's going on back in Star City – those were two very, very quiet episodes for me. So, it was great to watch Manu work."