Firehouse 51 is on high alert when a series of explosions rock the city. Herrmann adjusts to his new duties and Kidd gets a visit from an old friend.
| Name | Type | Role | |
|---|---|---|---|
| Matt Whitney | Writer | ||
| Matthew Abraham | Guest Star | ||
| Thom Dacey Carr | Guest Star | ||
| Jerry Kernion | Guest Star | ||
| Anthony Ferraris | Guest Star | ||
| Meg Thalken | Guest Star | ||
| Devin Bethea | Guest Star | ||
| Anne Ilonzeh | Guest Star | ||
| Patti Murin | Guest Star | ||
| Daniel Kyri | Guest Star | ||
| Rian Sheehy Kelly | Guest Star | ||
| Jennifer Weigel | Guest Star | ||
| Randy Flagler | Guest Star | ||
| Skye Ellis | Guest Star | ||
| Mac Rapach | Guest Star | ||
| Joey Gilmore | Guest Star | ||
| LaRoyce Hawkins | Guest Star | ||
| Laura Shoop | Guest Star | ||
| Kaitlin Yamano | Guest Star | ||
| Michelle Martinez | Guest Star | ||
| Tye White | Guest Star | ||
| Marina Squerciati | Guest Star | ||
| Jeff Kurysz | Guest Star | ||
| Batan Silva | Director |