Jesse Spencer returns to NBC’s Chicago Fire on Wednesday night as Matt Casey, the firefighter with a huge heart who thankfully can’t seem to stay away since moving to Portland.

In this week’s episode, titled “Danger Is All Around,” Casey goes home for both professional and personal reasons. Professionally, he’s leading a top-secret task force and he needs to pick a local representative — someone he trusts — to hold things down in Chicago while he remains committed to the Portland Fd.

“Casey gets involved with the Department of Homeland Security in Oregon because there have been potential domestic terror attacks across the United States, something he discovers after finding evidence of where future attacks could take place,” Spencer told Deadline during an interview Monday. “So he gets involved with the FBI, the Dhs, and becomes a special liaison for first responders in case these attacks do come to fruition.