This fall, CBS is expanding its supernatural comedy universe with the premiere of Eternally Yours, a new series from Ghosts showrunners Joe Port and Joe Wiseman. The show made its debut at San Diego Comic-Con, where the cast gathered to discuss the upcoming season. Naturally, the topic of a potential crossover between the two shows came up, and the stars had plenty of fun ideas.

Ed Weeks, who plays vampire patriarch Charles, immediately envisioned a clash with Isaac from Ghosts. "Having a quarrel with Isaac about who is the de facto leader of the group," he said, calling it an "arrogance-off." Jaren Lewinson, who plays Max, the human boyfriend of vampire Emma, suggested a more laid-back scenario: "Maybe just watch some sports with Jay." He added, "I think we would have a really nice time. It'd be a nice, really lovely, normal interaction for the both of us. He doesn't get to have that, and I don't think I do very much either. There's a lot of supernatural stuff going on." Weeks joked, "And he'd be able to see you, which is so lovely. That's one of my favorite qualities about you—how visible you are."

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Allegra Edwards, who plays vampire matriarch Liz, has a personal connection to Ghosts, having guest-starred as Pete's island girlfriend, Donna. She joked about reuniting with Pete: "I would have a little sit-down with Pete and freak him out because of how much I resemble a certain ex-girlfriend of his. I don't even have to do anything. It would just be Richie going, 'Do I know you?'" Helen J. Shen, who plays Emma, couldn't resist poking fun at Trevor's lack of pants: "I feel like a pants-less conversation would be like, 'I'm not not thinking about the fact that you're not wearing pants.' With Trevor. He's so funny. There's a dryness to his legs, his ashen, Asher legs."

Beyond the crossover chatter, the cast also revealed some juicy backstory details. Weeks shared that his character has stubbornly kept his English accent over 500 years, while Liz has assimilated into American culture. "I love the idea that I have kept mine, just stubbornly, whereas Liz has assimilated into American culture, and I refuse to. No, thank you. So, to me, that was kind of a statement in my kind of stick-in-the-mud conservatism."

Shen is excited to explore Emma's long history and why she's drawn to Max now. "To be in the body that she's in eternally, she's probably gotten many degrees, done many skills, experienced, honestly, everything under the sun, and to decide, 'I'm going to try the thing that I've never tried before'—normal—is quite an interesting kind of outside-in experience to me," she explained. "I'm excited to see how that deepens our relationship. Then, when, potentially, if things get rocky, how there's maybe some apprehension about it or, like, 'This is the whole reason why I didn't do normal before!'"

Lewinson, whose character Max is the show's main human, brings a fresh perspective. "I think that also brings a freshness and a newness, and sort of, I don't know if it's a little puppy energy in the grand scheme of how long everyone else has been alive," he said. "I think that Max probably is really excited because this is only the first time that he's really lived this life, versus maybe they have had several. So, I think hopefully, as Max interacts more with this family and this coven, he brings in some freshness and some excitedness."

Edwards also revealed a subtle costume detail that adds to Liz's backstory, thanks to the show's wardrobe team. "We've got some amazing wardrobe designers on our show, and they have such a task in front of them with the flashbacks, which is going to be fun, but also a lot of work," she said, giving credit to the below-the-line crew. The detail, which she didn't fully spoil, hints at Liz's long life and evolution.

As Eternally Yours films alongside Ghosts in Montreal, fans are already dreaming of a crossover. For more on the expanding universe, check out our Ghosts Season 6 details and why the BBC's Ghosts movie isn't a blueprint for CBS. And if you're a fan of shared universes, you might enjoy how Spider-Man: Brand New Day perfects the MCU shared universe.

Eternally Yours premieres this fall on CBS, Thursdays at 8:30/7:30c, following Ghosts.