Tunney's character is a prosecutor who hopes to put a movie star behind bars for the murder of his girlfriend. Eight years earlier, she was prosecuting the same guy for another murder-- but lost when he was acquitted of the crime.
"It's interesting. My character played by all the rules during the first trial and has a very strong sense of right and wrong," said Tunney. "You kind of see slowly through the season that I'm getting corrupted because I want to win."
"You're in for a lot of charged tension," said Akinnuoye-Agbaje. "It's high stakes. It's my life, my lifestyle, my family. And we are both prepared to go by any means necessary to prove who is right."
Tunney says former prosecutor Marcia Clark, who is a co-creator of "The Fix", was a huge help to her.
"She was able to write dialogue for me that nobody else could," said Tunney. "She knew what this character was feeling, at times, but she wasn't protective over making her perfect. It didn't seem like her vanity was getting in the way of how she made decisions."
Clark has insisted she is not re-living the O.J. Simpson case with "The Fix" and that after the first few minutes, it is pure fiction. Still, Akinnuoye-Agbaje says there are parallels.
"But the one thing we know is different from the O.J. trial to "The Fix" is we know the outcome in the O.J. trial. In 'The Fix,' you don't!" Akinnuoye-Agbaje said.
But over 10 episodes, you will.
"The Fix" airs Monday nights at 10 p.m. on ABC.