Published May 12, 2026, 9:00 a.m. ET When 9-1-1 co-creator, showrunner, and writer Tim Minear spoke with Decider midway through Season 9, he teased a storyline he was “pretty excited” about that would carry into Season 10. Having seen the eventful finale, fans now know he was talking about Buck (Oliver Stark) fostering his biological son, Theo (Lincoln and Theodore Sykes), which is sure to shake things up in the future. “I didn’t really envision bringing the [Season 6 sperm donor] storyline back. It just felt like it was time,” Minear told Decider via Zoom ahead of Season 9’s finale. “The story was actually telling me that it was time. It wasn’t some sort of cynical ploy. It was like, Buck needs someone new to love.” As fans saw through Hen (Aisha Hinds) and Karen’s (Tracie Thoms) foster parent journey earlier in the series, Buck will encounter a trying time in Season 10 as he navigates the foster system and the show explores why he’s the person caring for Theo.…