9-1-1’s Eddie Diaz and Evan “Buck” Buckley are ready for the adventure of a lifetime — but their fun-filled road trip is about to turn into a total nightmare.
In Us Weekly’s exclusive sneak peek at the Thursday, March 12, season 9 episode, titled “Mother’s Boy,” Eddie (Ryan Guzman) and Buck (Oliver Stark) are cruising back from the National Firefighter Games in Nashville and headed home to Los Angeles when disaster strikes.
Moments before the chaos ensues, the pair are seemingly making amends after a disagreement as Buck tells Eddie, “I’m sorry I called you gloomy. And I’m sorry I got us lost,” to which Eddie replies, “No, you were right. We both decided to go the backroads.”
That’s when Eddie notices a large, suped-up truck tailing them with high beams glaring in their mirrors. As Eddie tries to drive away from the car, it speeds up, running him off the road. Buck attempts to call 9-1-1 before things get worse, but there’s no service out in the middle of nowhere.
“Hang on!” Eddie yells as the truck accelerates and starts jamming them from behind. He begins to lose control of the wheel before the scene cuts to black.
“Mother’s Boy,” which is the first episode following 9-1-1’s crossover with 9-1-1: Nashville earlier this month, follows Eddie and Buck as their flight back to Los Angeles gets canceled. Hoping to be home for Hen’s (Aisha Hinds) birthday, they decide a cross-country road trip is the fastest way, until they get off track and Buck goes missing.
While speaking to TV Fanatic, Stark, 36, previously hinted that Buck will have a “very trying” end of season after the mysterious events of episode 13.

Oliver Stark, Ryan Guzman Disney/Christopher Willard
“He’s really going to be put through it and have to deal with some new things, and the repercussions are not going to be something he moves past particularly quickly,” he explained. “So, he’s got a tough little road coming up. Then, as we move towards the end of the season, some big changes for him and some big questions to be answered, and some decisions to be made in terms of what his life might look like going forward.”
Stark also told Entertainment Weekly that viewers should expect a different tone throughout “Mother’s Boy,” which he said felt like shooting a “different show” than 9-1-1. “The look of the show is very different,” he said. “It was just a really enjoyable, refreshing experience.”
Guzman, meanwhile, echoed Stark’s sentiments, saying the episode really does feel “like its own thing.”
“The way it was shot, the coloring — everything is a little darker,” Guzman explained, before adding, “But it always has to have some levity. It’s 9-1-1 at the end of the day.”
9-1-1 season 9 episode 13 airs on ABC Thursday, March 12, at 8 p.m. ET.
