Just in time to ring in 2021, Netflix is releasing the fourth and final part of Chilling Adventures of Sabrina, closing out the popular Archie Comics adaptation with Sabrina Spellman leading her family and friends to save Greendale from a sinister host of eldritch terrors. Stepping up to confront the supernatural evil are Sabrina's best friends Roz Walker and Theo Putnam, portrayed by Jaz Sinclair and Lachlan Watson, respectively.

In a roundtable interview attended by CBR, Watson and Sinclair shared the things they enjoyed the most about starring in the series, what they'll miss the most and the creative directions they strove for their characters to undertake.

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Of the incredible changes and challenges the characters face in Chilling Adventures of Sabrina Part 4, one of that strikes particularly close to home is Theo being possessed by an incubus as the eldritch terrors menace Greendale, as seen in the final season's announcement teaser. For Watson, the development was one of their favorite moments of the season.

"It was amazing! It was so weird and fun," Watson said. "Theo doesn't really get to go into the supernatural stuff that often. He's always there to clean-up but he never really is in the down and dirty so that was absolutely hilarious, I had the best time with that. I was really excited because their eyes turn yellow, so I was really excited to wear contacts. But on the day of they were like, 'Oh, we're doing it with visual effects,' and I got so mad but I just saw it in the trailer and it looks amazing so I'm glad it all turned out but it was really fun."

One aspect of the Chilling Adventures of Sabrina that has steadily developed from the start and continues to play a major role in Part 4 is Roz, Theo and Harvey Kinkle forming their own high school garage band. In response to a question from CBR, the pair discussed how it was to continue to develop this musical side of their characters throughout the series.

"It's been so fun. We already like to jam together and sing together and Lachlan has the voice of an angel baby goddess child," Sinclair said. "So to do that together was such a seamless transition and anytime you're moving on set or performing [while] performing, the days go by really fast so all those days just felt like playing to me and I really loved them. And there's more [in Part 4]!"

"It gets wilder and wilder and wilder, I can't wait," Watson added. "We really got to have some fun with the ones in Part 4, we really got to go all-out in the performance and the energy and the vibes. But I know Jaz and I both dabble in music; I know Jaz is becoming a bit of a world-renowned musician as we speak. [Sinclair laughs] But I know it was really cool for both of us to be able to take those skills and learn new things: Jaz plays the bass now and I play the drums now and we had to learn that for Sabrina and that's really cool. And for both of us to be in recording studios for the first time and be on Spotify -- you can find our songs on Spotify from the show -- which is so cool. I don't either of us expected to get that out of this experience so to get to walk away feeling empowered about music was really neat."

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Sinclair and Watson noted that the musical incorporation into the Chilling Adventures of Sabrina resulted from showrunner Roberto Aguirre-Sacasa noticing the young cast singing on set and deciding to write it into the episodes. Watson observed that if Aguirre-Sacasa saw two actors having natural chemistry during production, he would write scenes for their characters to share. Watson complimented Aguirre-Sacasa for this flexibility, with this quality making him "a really good showrunner who just serves [his] actors and to play to their strengths is really cool, strengths sometimes you don't know you even have!"

Both Watson and Sinclair reflected that they would miss the musical aspect of their time on Chilling Adventures of Sabrina and the entertaining table reads between the cast each season, with the table reads described as lively and epic and ensemble-building, especially for co-stars they didn't normally share scenes with.

Watson admitted that Chilling Adventures of Sabrina's final season was uniquely challenge in its own way, with Theo crying a lot and engaging in love scenes that left Watson a bit emotionally vulnerable as an actor. Sinclair recalled that the most challenging scene for her was Sabrina's coronation as Queen of Hell, with the mortal characters enduring lengthy shoots where they were required to stand still for most of filming. Sinclair also found filming scenes where Roz was temporarily stricken blind as a challenge, not being to express with her eyes for those scenes as she had naturally all her life.

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Sinclair and Watson both felt they grew with their characters, both as performers and people, some moments in their personal lives mirroring their character arcs more directly than others. Sinclair was especially ready for Roz to discover she was also a witch in the final season.

"It was like my Harry Potter 'You're a wizard' moment and I've been waiting since I was a little girl for that. So that was really special for me and I was smiling that big the whole day on set," Sinclair shared. "I loved that."

"I think [my favorite scene] was the opposite of that, I had one scene I was just dreading completely and that was Robin and Theo's mini-breakup," Lachlan admitted. "I think me and Jon, who plays Robin, both read that and were like 'Oh, man!' because we spent so much time cultivating this beautiful thing with Theo and Robin and we only got an episode at a time, we were never informed of our whole arc; I think Kiernan [Shipka] was the only one that got that privilege to know how her character started and ended. Me and Jon were both like '...is that it?' because we didn't know! We did all our scenes together so we made out for ten hours and broke up for five, and it was just a really emotional day, but I think it was that same build-up and suspense. We both walked away and were like, 'We did really good work today.'"

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In response to a question from CBR, Watson and Sinclair shared how their experience growing into their characters helped inform how they approached the Chilling Adventures of Sabrina's creative team in developing them.

"We saw Theo has such a hard time in the first two parts and I think a lot of queer people can relate to that aspect of queer tragedy and queer suffering but that's not all there is to being a queer person or being any sort of teen having a hard time; it's not all bad all the time," Watson explained. "I feel like some queer narratives can really get focused on that and get focused on that hard part and so I was really, really excited to come back for Season 2 -- which is Parts 3 and 4 -- and just show some queer joy and just show a version of a happy ending and to show some positive growth and show some reclamation of power and to take that happiness back and really embody that and to allow Theo to have that and to allow all these queer, or otherwise, kids watching to realize that it does get, it's not all bad and you do deserve so much good things, so much happiness and so much joy...even if does come in the form of a 3,000-year old hobgoblin! There is joy out there in the world for you and I was really passionate about telling that story because it felt like the only way to go with Theo. Theo just needed that empowerment and I'm glad we got the chance to show that."

"I had a really good conversation with Roberto because, when I signed on to the show, I was really excited to play this feminist, loud, unscared girl in this witch world and we get to experience so many things," Sinclair recalled. "And then in Part 3, it was mostly cheerleading and questionable friendship decisions with Harvey and all that. And I had a really good conversation with Roberto right before Part 4 -- maybe at the end of Part 3, I don't remember -- where I was just like 'I want these parts of Roz back. I really liked the feminist, I like this and I really want this mixed relationship to have justice because you're going to do it, we're going to do it and if you're not going to do it, that's fine too but if we're going to do it, let's make it full and beautiful and lovely.' And he was like 'Thank you for bringing these things to my attention, I just have 800 characters that I'm writing and I didn't realize that.' And totally took everything that I said to heart and that's why Roz gets so much cool stuff in Part 4, because he was so receptive to that conversation and really did everything in his power to give me a lot of juicy, fun, deep, lovely stuff. So I'm super grateful to him for hearing me."

Arriving Dec. 31 on Netflix, Chilling Adventures of Sabrina Part 4 stars Kiernan Shipka as Sabrina Spellman, Ross Lynch as Harvey Kinkle, Michelle Gomez as Mary Wardwell/Madam Satan, Jaz Sinclair as Rosalind Walker, Lachlan Watson as Theo Putnam, Gavin Leatherwood as Nicholas Scratch, Tati Gabrielle as Prudence Blackwood, Chance Perdomo as Ambrose Spellman, Lucy Davis as Hilda Spellman, Richard Coyle as Faustus Blackwood and Miranda Otto as Zelda Spellman.

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