The Grey Sloan doctors spring into action after an explosion rocks Seattle, with the incoming trauma hitting close to home. Owen experiences PTSD after he hears the explosion, while his sister Megan enlists help from Winston and Hayes in confidence. In Minnesota, Meredith and Amelia meet up with a familiar face who assists in their study

Peter Gallagher guest-stars as David Hamlton, who Meredith is working with and for when she's in Minnesota.

Mer is excited to show off some progress that she's making in her research to David Hamilton in Minnesota.

The Grey Sloan doctors spring into action after an explosion rocks Seattle, with the incoming trauma hitting close to home. Owen experiences PTSD after he hears the explosion, while his sister Megan enlists help from Winston and Hayes in confidence. In Minnesota, Meredith and Amelia meet up with a familiar face who assists in their study

Amelia is exploring some new feelings and new connections when she works alongside Kai in Minnesota.

Amelia gets close to and works alongside Kai (E.R. Fightmaster) on the clinical trial in Minnesota..

The Grey Sloan doctors spring into action after an explosion rocks Seattle, with the incoming trauma hitting close to home. Owen experiences PTSD after he hears the explosion, while his sister Megan enlists help from Winston and Hayes in confidence. In Minnesota, Meredith and Amelia meet up with a familiar face who assists in their study

Mer is looking flirty and having fun when she heads back to Minnesota to work on the trial and see NIck.

Meredith drops in on Nick on his turf when she returns to Minnesota and takes time away from the trial.

Nick (Scott Speedman) is still in Minnesota and spends some time with Meredith when she returns again.

Megan enlists help from Hayes and Winston in confidence when it pertains to her son needing assistance.

Megan (Abigail Spencer) and Hayes (Richard Flood) continue to bond with each other while he saves Farouk.