Watson Finale Shockers: Craig Sweeny Spills on Ending, 2-Season Journey & Lost Season 3 Plans!

WARNING: SPOILERS AHEAD: This article discusses key plot points from the Season 2 finale of CBS’ Watson.

John Watson and Sherlock Holmes’ destinies converge one final time in the latest Season 2 finale of Watson, which also marks the end of the series following its cancellation by CBS.

In the final episode, Watson (played by Morris Chestnut) joins Mary (played by Rochelle Aytes) on a journey to Baltimore for an operation to address his glioblastoma, which has been causing hallucinations of Sherlock all season. Meanwhile, a physically present and confused Holmes finds himself admitted to the Holmes Clinic in Pittsburgh. Learning of this, Watson halts his surgery to rush to his friend’s aid. He figures out the root of Sherlock’s condition, but the postponement of his own critical surgery results in Watson suffering a severe seizure.

After regaining consciousness, Watson declares his love for Mary, who returns his feelings. The surgery is rescheduled to take place in Pittsburgh. The episode concludes in the operating room, accompanied by Watson’s vision of a future with Mary at 221B Baker Street in London, a plan he had envisioned during their deep conversation earlier that day. (In Sherlock Holmes lore, the famous detective resides at this iconic address with Watson.)

In a conversation with Deadline, Watson creator and executive producer Craig Sweeny shared his thoughts on crafting the finale and the implications of its conclusion, including the vision of Baker Street.

“Writing the season finale was complex because we were still shooting without knowing if we would return,” he explained.

The decision to cancel Watson came after the completion of Season 2’s production.

“We approached it primarily as a season finale, but added a teaser that hinted at a possible future for Watson and Mary,” Sweeny added. “The scene set at Baker Street can be interpreted in several ways—it might even be a dying vision Watson experiences while on the operating table. I have my own interpretation, but I prefer to leave it open for the audience to decide.”

At the series premiere in January 2025, Sweeny told Deadline that the show was developed under the assumption that Sherlock is deceased. “I’d like to keep it that way unless a compelling story emerges, but currently, we don’t plan to have Sherlock as a regular character in Watson,” Sweeny remarked at the time.

After the Season 2 finale, Sweeny discussed with Deadline how the idea of integrating Sherlock into the show evolved—from a hallucination due to Watson’s tumor to an actual character—and what was planned for their storyline in Season 3.

“For the third season, Watson would have continued as Sherlock’s physician, addressing complications from the condition Sherlock suffered at the season’s end,” Sweeny noted. “Originally, we imagined Holmes as merely a figment of Watson’s imagination, a clue to his own medical condition. But Robert Carlyle’s portrayal of Sherlock Holmes was so compelling that we revised our plans to include him in reality. Writing scenes for Watson and Holmes together was immensely enjoyable and rewarding.”

The Season 2 finale also left several storylines open for the younger doctors, including the ongoing investigation into Beck’s death, the search for Sasha’s birth mother, and Sasha (played by Inga Schlingmann) ending her relationship with Stephens (played by Peter Mark Kendall). Season 3 would have concluded their fellowship arcs.

“The core of Watson was always the cases, so had we returned, we would have continued to explore the unusual and extraordinary scientific anomalies that characterized our most compelling episodes,” Sweeny explained. “Since medical fellowships typically last three years, a significant theme for season three would have been what happens to Ingrid, Stephens, Adam, and Sasha at the end of their fellowships and how we would integrate new doctors into the mix.”

Reflecting on the series’ two-season journey, Sweeny expressed a mix of sadness and gratitude. “It’s disheartening that we won’t produce more episodes, but I’m thankful for the 33 episodes we were able to create. I enjoy writing procedurals that push the boundaries of known science, and Watson provided that opportunity weekly,” he stated.

Sweeny also highlighted his previous experience on CBS’ Sherlock Holmes/Dr. Watson procedural Elementary, where he served as executive producer for most of his tenure. He praised Watson executive producer Dr. Shäron Moalem, who brought invaluable insights from decades of work in genetics, crucial for crafting episodes that explored the cutting-edge of medical possibilities.

Sweeny also lauded the collaborative atmosphere on the Watson set. “Producing Watson for two seasons has been a fulfilling experience for everyone involved, from the producers to the cast and crew. We fostered close-knit communities in both Los Angeles and Vancouver,” he mentioned, noting the series was written in Los Angeles and filmed in Vancouver. “I’ve had many career highlights, but the warm and collegial environment on Watson was truly unique. I am particularly grateful to Morris Chestnut for his leadership; his dedication significantly contributed to making the Watson set a pleasant workplace for all.”

As he concludes this chapter on Watson, albeit prematurely, Sweeny focuses on the positives. “While we all grieve the end of the show and the community it created, we also cherish the opportunity to have brought as much of Watson to life as we did,” he concluded.