“We might have a little something up our sleeves,” Mason Thames exclusively told TooFab when chatting about his and McKenna Grace’s upcoming joint Halloween costume—following their 2024 run of four fun character pairs, including Scooby-Doo fan favorites Shaggy and Daphne.

At 18, Mason Thames is officially stepping into his coming-of-age film era—and he’s embracing every minute of it. While walking the red carpet for his new movie Regretting You, the actor opened up to TooFab about what this career shift means to him.

“I’ve been wanting to do a movie like this forever,” Thames said, noting he’s practically grown up in Hollywood. His resume already includes standout roles in The Black Phone, Incoming, and How to Train Your Dragon—making this new chapter feel like a natural (and exciting) next step.

Regretting You, based on Colleen Hoover’s story of family, first love, grief, and betrayal, sees Thames play Miller Adams: a kind-hearted guy from the “wrong side of the tracks” who becomes the romantic interest of McKenna Grace’s Clara Morgan. And he’s quick to credit his co-star for making the experience unforgettable.

Grace, 19, has an equally impressive Hollywood track record—with roles in Ghostbusters, The Haunting of Hill House, The Handmaid’s Tale, and Young Sheldon—and she’s also making the move to more mature projects, just like Thames. Rumors have swirled that their on-screen chemistry has spilled over into real life, too.

“Getting to do this movie with McKenna? It’s so special,” Thames gushed. “I couldn’t have asked for a better partner to go through this journey with.”The duo was first announced as Regretting You’s leads back in 2024, and later that year, they shared photos of their four Halloween costume duos (Shaggy and Daphne included). Dating rumors kicked into high gear in April 2025, though, when a TikTok of the two kissing went viral right before the film’s release. Since then, they’ve been spotted holding hands in public—only fueling more speculation from fans.

When it comes to this year’s Halloween plans, Thames basically confirmed they’re teaming up again for a costume—but he’s playing coy about the details.

“Who knows…” he said with a playful grin. “We might have a little something schemed up.”Thames is clearly on a roll this week. Not only is Regretting You now in theaters, but his latest horror flick, Black Phone 2, just debuted with a massive $43 million global opening—and it’s earning rave reviews to boot.

Even Saturday Night Live took notice: Marcello Hernandez gave the film a shoutout this past weekend when he brought back his Weekend Update character The Movie Guy, a cinephile with a notoriously spotty viewing record. “Oh, yeah, Black Phone 2—ring, ring! Hello? Sorry, wrong number, ‘cause I haven’t seen that one yet,” Hernandez joked during the October 18 episode.

“What I love most about The Black Phone movies is that yeah, they’re horror, but they have so much heart,” Thames told TooFab. He also added that he and Grace were both thrilled about the SNL mention—you can catch their reaction in the full interview above.