After she and Nathan Riggs walked off into the sunset back in season 15, we didn't expect to see Abigail Spencer return as Owen's sister Megan! At the start of season 18, however, she returns for her brother's wedding to Teddy, revealing in the process that she and Riggs split up during the pandemic. It looks like she'll be sticking around, too: Deadline reported Spencer would recur throughout the season.
Spencer has appeared on quite a few shows that you've watched over the past several years! She had recurring roles on Suits and Mad Men. She also starred on the drama Rectify and, more recently, the sci-fi series Timeless.