WARNING: This article contains spoilers for Billions season 4 that may influence your enjoyment in discovering the plotlines. Read at your own risk.

Billions season 4 is airing its finale episode on Sunday, June 9, at 9:00 p.m. on Showtime. Titled "Extreme Sandbox," this final outing of the season promises to be a suspense and drama-filled offering as the dynamic shifts between highly competitive financial opportunists.

The teaser of Billionsseason 4 episode 12 finale shows Axe (played by Damian Lewis) and Chuck (played by Paul Giamatti) receiving a warning that the FBI is coming for them. This episode also hints that revenge is going to be a big part of the story but who's got the upper hand? 

"I want you to help me take him down," Chuck says with determination in the teaser. "I wanted to let it go, but then I decided -- F*** it!" Axe's voice-over declared. 

It's no secret that both Axe and Chuck have been planning to take out their competition, Taylor (played by Asia Kate Dillon), in Billions season 4. In episode 11, Axe showed that he's willing to risk it all to bring down his biggest threat, even if this means his destruction.

Amid the advice of his trusted allies, Axe decided to enter into a risky venture and bypass the law just to get ahead of Taylor and his other competitions in Billions season 4 episode 11. No one could stop him from his destructive path, though. Not Wendy (played by Maggie Siff), whom he usually listens to, and not even his girlfriend Rebecca (played by Nina Arianda), who doesn't feel comfortable about Axe's decisions. 

Rebecca, however, came up with a plan of her own in Billions season 4 episode 11 and bought a company while retaining Taylor's shares. She figured she could take control of Taylor this way, thus avoid ruining what they've built.

Taylor's got other plans, as well, which is to finish this war with Axe and Chuck. However, by the end of Billions season 4 episode 11, Axe receives a tip about the new company they bought into, and it could give him the upper hand against Taylor. The only problem, however, is that this might cost his relationship with Rebecca.

Billions season 4 is setting up another crazy ride for season 5, which Showtime renewed in early May, as per Deadline. The show also stars David Costabile, Jeffrey DeMunn, Condola Rashad and Kelly Aucoin.