'Outlander' stars Sophie Skelton and Richard Rankin, and executive producer Maril Davis, on new character Rob Cameron: 'Not someone to be trusted'

• Warning: There are spoilers ahead for season seven, episode six, of the Starz drama "Outlander."
• Sophie Skelton and Richard Rankin spoke to Insider about their characters' new frenemy, Rob Cameron.

It's been a long time since "Outlander" has featured the kind of villain that audiences love to hate, but it seems like Brianna (Sophie Skelton) and Roger (Richard Rankin) might have just crossed paths with someone who fits that description to a T.

In the latest episode of the sweeping Starz drama, titled "Where The Waters Meet," viewers saw more of Brianna's new work colleague, Rob Cameron (Chris Fulton), as he got acquainted with Roger after discovering that both his nephew and the couple's son attend the same school.

It wasn't the only unexpected surprise for Rob in the episode, though, as Roger accidentally delivered his notebook — handily titled "A Practical Guide for Time Travelers" — straight into his lap, after getting it mixed up with some other papers.

The question now is what will Rob do with the information he's read? And what does that mean for Brianna and Roger, who have only just settled into the rhythm of life in the 20th century?

"Rob definitely becomes a pretty prominent character in the story," Skelton told Insider in an interview conducted before the SAG-AFTRA strike.

"It's an interesting dynamic at first because I think Roger gets a better inkling of who Rob is at heart than Brianna does," she said. "It was great to have new characters. I loved working with Chris."

Rankin agreed and praised Fulton's performance.

"The character's written well but Chris particularly has this thing about him where he's so brilliant at being deceptive and duplicitous. He has this earnest, charming way about him, so Roger has a suspicion but nothing to act upon," said the actor.

Executive producer Maril Davis also warned viewers about Rob's intentions.

She said: "Right now, we just see that Rob is someone that Brianna works with and he's a good guy, but he might have nefarious things up his sleeves."

"Rob Cameron is not someone to be trusted," she added.

As for where the storyline with Rob will lead the characters, Skelton and Rankin said that viewers will indeed see the dinner party Roger unexpectedly found himself agreeing to, and Rob possibly revealing more of his intentions throughout the course of the meal.

Of the scene, Skelton teased: "I feel like he flirts a little bit with Brianna at the dinner table."

"He definitely does a bit of flirting," Rankin corrected her.

"He lures her into a false sense of security," Skelton continued, while Rankin — displaying his character's protectiveness over Brianna — chose not to mince his words: "He's a bastard."

Episode six of "Outlander" season seven is now available to stream on Starz.com, and also airs at 8 p.m. Friday on Starz.