Things got so bad that she actually went to his wife to talk to her about how she could improve her relationship with him.
This led fans to take to Twitter with concern that the tension between Marissa and Bull could be a sign the character is heading for an exit from the series.
But before you start to worry, there is nothing from CBS to suggest that she is leaving the show in the near future.
In fact, executives of the show, including Kathryn Price, have openly discussed the character's longevity on the show, and the fact she is pivotal to the rest of season 6.
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Who is Marissa Morgan in Bull?
Bull is inspired by the exploits of real-life trial science expert Dr. Phil McGraw.
Starring Michael Weatherly as the series' titular Dr Jason Bull, the show chronicles the legal maneuverings of the Trial Analysis Corporation (TAC) team as they prep their clients for upcoming hearings.
In addition to the triple-PhD-equipped Bull, the elite TAC team also includes neurolinguist Marissa Morgan, who is his second in command.
As the team member responsible for monitoring jury behavior and reactions in real-time, Marissa is perhaps the team's most critical frontline member.
Who Who plays Marissa in Bull?
Marissa is played by stage and screen actress Geneva Carr.
Born May 6, 1971, the 50-year-old star has an extensive acting resume.
Aside from Bull, she is best known for playing Margery in the original Broadway cast of Hand to God, for which she earnt a nomination for the Tony Award for Best Actress in a Play.
When is Bull next on?
Bull season 6 is available to watch weekly on Thursdays on CBS at 10pm ET/PT or 9pm CT.
Alternatively, new episodes of Bull appear on the Paramount+.
Additionally, new episodes of Bull are also available to purchase from Amazon Prime Video and Apple TV.