Tyrell Wellick (Martin Wallstrom) made a few appearances in “Mr. Robot” Season 2, and they say nothing about what exactly his participation in the 9/5 hack and Elliot’s (Rami Malek) grand plan. He finally appeared in episode 11, much to Elliot’s shock. The fsociety founder was already clinging on to the idea that he killed Tyrell, so seeing him has made him question whether he was just making the image of the former E Corp executive up.

Whether the Tyrell Elliot saw was real or not has yet to be determined, but Wallstrom is confident that his character’s return -- as an illusion or the real thing -- will bring “something exciting.”

Speaking with The Hollywood Reporter, Wallstrom hinted that there are bound to be more surprises and viewers should be attentive to his character since it’s hard to tell what Tyrell’s plans are or where his loyalties lie.

“He’s as unreliable as always,” the actor said. “I think the beauty of him is that you’re never quite sure on where you have him. Even if you think he’s telling the truth, maybe he’s not. But it’s hard to talk about before you know more. He’s on his way to something exciting, if I want to give a boring answer.”

Before the previous episode ended, Tyrell told Elliot that he will be pleased when he sees that Phase 2 of their mission is already in place, but so far nobody knows for sure what the plan is about. There is also a chance that it will not be part of the second part of the final episode, although the answers might be found right after the credits.

Series creator Sam Esmail has teased via Twitter that there will be a scene that viewers should keep an eye out for after the credits. The first season of the show also featured a scene after the credits rolled out, which introduced the connection between Phillip Price (Michael Cristofer) and Whiterose (BD Wong).

“Mr. Robot” Season 2 will air its final episode on Wednesday, Sept. 22, 10 p.m. on USA Network.