Although 9-1-1: Lone Star recently concluded, its flagship show, 9-1-1, is still going strong after switching to ABC in 2024. It is currently in its eighth season with “Invisible” set to air on Thursday, April 3 at 8 p.m. ET. In February 2025, Deadline reported that the franchise’s latest spinoff would be set in Nashville, receiving a straight-to-series order from the network.
When speaking with ScreenRant, Oliver Stark, who plays Buck, was asked if he was interested in potential crossovers with 9-1-1: Nashville. The actor responds with enthusiasm, proposing that Chris O’Donnell’s character could be Buck’s cousin, giving the firefighter a reason to visit. An appearance in ABC’s Doctor Odyssey was originally pitched to Stark, but only Angela Bassett ended up boarding the cruise. Therefore, the star would love to explore the 9-1-1 universe in additional ways. Check out his full quote below:
ScreenRant: 9-1-1 is getting another spinoff. Would you be interested in having Buck go over to Nashville?
Oliver Stark: Yeah, let’s go! I feel like Buck would have a lot of fun in Nashville. I saw they cast Chris O’Donnell, could be Buck’s cousin. I’m putting that out there. I could pay a visit to him in Nashville and find myself stumbling down Broadway. Yeah, I would love that. Dr. Odyssey didn’t quite work out, so ship me off to Nashville, and I’ll be there.
Everything We Know About 9-1-1: Nashville
It Will Serve As The Third Series In The Franchise 9-1-1: Nashville is written and executive produced by Ryan Murphy, Tim Minear, and Rashad Raisani. Brad Falchuk and Angela Bassett will also be on board as executive producers. 9-1-1: Nashville is the third series in the franchise, but a fourth show exists within the universe. Murphy’s medical drama, Doctor Odyssey, crossed over when Bassett’s Athena Grant boarded the ship in the March 20 episode, titled, “Casino Week.”
Fans of 9-1-1 are buzzing after Oliver Stark, the actor behind Evan “Buck” Buckley, shared an exciting crossover idea that could bring Chris O’Donnell into the 9-1-1 universe! Imagine a world where Buck has a long-lost cousin—and it’s none other than G. Callen from NCIS: LA! Let’s dive deep into this thrilling concept and explore how it could shake up both franchises.
A Game-Changing Crossover Idea
Why Chris O’Donnell?
Chris O’Donnell has built a massive fan base through his portrayal of G. Callen in NCIS: Los Angeles. His action-packed performances and strong on-screen presence make him the perfect candidate for a 9-1-1 crossover. Plus, he and Oliver Stark share a striking resemblance—making the cousin theory even more believable!
Oliver Stark’s Pitch
During a recent interview, Stark casually mentioned how cool it would be if Buck had a cousin who worked in law enforcement. He even suggested that Chris O’Donnell could take on the role! The idea instantly caught fire among fans, sparking theories about how such a crossover could work.
How the 9-1-1 & NCIS Universes Could Connect
Expanding the 9-1-1 Universe
With 9-1-1: Lone Star and the upcoming 9-1-1: Nashville, the franchise is already growing. Adding Chris O’Donnell’s character could link the firefighting world of 9-1-1 with the crime-solving action of NCIS, making for an unforgettable storyline.
Possible Storylines for the Crossover
1. A Family Reunion Turns into a Rescue Mission
Buck and his newfound cousin reconnect just as a major disaster strikes, forcing them to work together. A bridge collapse, a hostage situation, or even a major wildfire could bring the two worlds together.
2. A Criminal Case That Needs Both Teams
G. Callen (O’Donnell) could be in Nashville investigating a criminal case when he crosses paths with Buck. Maybe a serial arsonist or a terrorist attack requires both firefighters and federal agents to collaborate.
3. Buck’s Hidden Past
What if Buck discovers a shocking family secret? Maybe his real father was involved in something much bigger—connecting him to Callen’s investigations.
Why This Crossover Makes Sense
1. Fan Engagement
Both NCIS and 9-1-1 fans love a good crossover. This one could drive massive viewership, trending on social media and boosting ratings.
2. Strong Character Chemistry
Oliver Stark and Chris O’Donnell share similar energy and charisma, making their on-screen dynamic natural and believable.
3. Expanding the Franchise
The 9-1-1 universe keeps growing, and this could open doors for more collaborations with action-packed shows.
What the Fans Are Saying
Twitter Explodes with Reactions
Fans have already taken to social media, sharing excitement and creating fan art of Buck and Callen together. Some have even suggested NCIS: Nashville as a potential spin-off!
Casting Dreams & Wishlists
Would Chris O’Donnell say yes? Fans are tagging him on social media, urging him to consider the role. Meanwhile, others are dreaming of guest appearances from LL Cool J, Angela Bassett, and Rob Lowe.
What Needs to Happen for This to Become Reality?
1. Network Approval
Fox and CBS would need to agree on a crossover deal, ensuring both franchises benefit from the partnership.
2. Scheduling Conflicts
Chris O’Donnell’s availability could be a challenge, but with NCIS: LA ending, he might be open to new opportunities.
3. A Solid Script
Writers need to craft a story that seamlessly blends the action-packed drama of both shows while staying true to the characters.
Could This Lead to More Crossovers?
If this works, we might see even bigger TV crossovers, with characters from shows like Chicago Fire, FBI, or even The Rookie joining the 9-1-1 universe!
Conclusion
Oliver Stark’s crossover idea has sparked major excitement. While nothing is official yet, the thought of Chris O’Donnell joining 9-1-1 as Buck’s cousin is thrilling. If the networks can make it happen, we might be looking at one of the biggest TV events of the year!
