Kaitlin Olson Brings 'High Potential' Drama to 'It's Always Sunny in Philadelphia' Set

The actress and her real-life husband Rob Mac hint at an epic Season 18 fight on the long-running comedy series.

Published on Feb. 25, 2026

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In a behind-the-scenes video posted to Rob Mac's Instagram story, Kaitlin Olson, who plays Dee Reynolds on "It's Always Sunny in Philadelphia," discusses returning to film the show's latest episodes and a fight scene with her husband. Olson, who also stars in the ABC drama "High Potential," says Mac wants to do the fight scene without pulling any punches, but he later remarks that Olson may have forgotten they are filming a comedy, not a drama.

Why it matters

The video provides a humorous glimpse into the dynamic between Olson and Mac, who are not only co-stars but also real-life spouses. Olson's transition between her dramatic role on "High Potential" and the comedic tone of "It's Always Sunny in Philadelphia" suggests the potential for some interesting character development and storylines in the upcoming season.

The details

In the video, Olson says it's her first week back on the set of "It's Always Sunny in Philadelphia" and that she has a fight scene with her husband, Mac. Olson expresses concern about the intensity of the fight, but Mac insists they should just "do it" without pulling any punches, despite having stunt people available. The camera then pans to Mac, whose face appears to be battered and bloody, and he comments that Olson may have forgotten they are filming a comedy, not a drama.

  • Olson and Mac are currently filming Season 18 of "It's Always Sunny in Philadelphia".

The players

Kaitlin Olson

An American actress best known for her role as Dee Reynolds on the FXX comedy series "It's Always Sunny in Philadelphia." She also stars in the ABC drama "High Potential.".

Rob Mac

Kaitlin Olson's real-life husband, who also stars as Mac on "It's Always Sunny in Philadelphia." He is known for his comedic acting and his close working relationship with Olson on the show.

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What they’re saying

“So it's my first week back to Paddy's, and I have a fight scene with my husband who, all the time is just like, 'Let's just do it, like we have stunt people, but whatever… just do it, don't pull any punches,' and I'm like, 'Are you sure?' and he's like, 'Yeah.' And now he won't shut the f**k up about it.”

— Kaitlin Olson, Actress (Instagram)

“I just feel like you're on the show for a long time and forgot that it's comedy.”

— Rob Mac, Actor (Instagram)

What’s next

Fans will have to wait for the premiere of Season 18 of "It's Always Sunny in Philadelphia" to see how the dynamic between Olson and Mac plays out on screen.

The takeaway

The behind-the-scenes video showcases the playful and collaborative relationship between Kaitlin Olson and Rob Mac, hinting at the potential for some exciting and humorous storylines in the upcoming season of "It's Always Sunny in Philadelphia" as Olson brings her dramatic skills from "High Potential" to the long-running comedy series.