In the season finale of "Mr. Robot," computer hacker Elliot Alderson (Rami Malek) tries to save his sister Darlene (Carly Chaikin) from the FBI.

The trailer for the upcoming installment titled "eps3.9_shutdown-r" was released just recently and it shows Elliot at home with his ear pressed against a door. Apparently, Whiterose (BD Wong) and his minions are keeping an eye on him because they think he might disrupt their plans.

In the meantime, he has to find a way to get to his sister who is currently in FBI custody. She was arrested for trying to steal Agent Dominique DiPierro's (Grace Gummer) identification card. Darlene remains handcuffed to a bar in an interrogation room.

It remains to be seen how Elliot will be able to evade the Dark Army and hack his way into the FBI in order to get his sister out of there.

In a recent interview with Entertainment Weekly, Gummer teased a bit about the finale.

"There's so much crazy s— that happens... But I can tell you that I went to pretty dark places in my mind. And the episode is pretty dark. And you see different sides to everyone and unexpected," she expressed.

It appears that relationships are going to evolve and some characters' allegiances may shift in the process.

Gummer further added, "I don't even know what to say, I don't want to ruin anything [laughs]. I did work the longest, most grueling hours that I've worked on the show on that episode, so everyone is in for a treat."

It remains to be seen if Elliot will be able to take down Whiterose's computer system and empire, and save everyone close to him.

"Mr. Robot" season 3 episode 10 will hit the airwaves on Wednesday, Dec. 13 at 10 p.m. EST on the USA network.