| John Ellis, a disillusioned suburban ER doctor, who finds his existence transformed when he intervenes in a drive-by shooting, saving a young boy's life and killing one of his attackers. When he learns the boy is still marked for death he finds himself compelled to save him at any cost and discovers that his life and his outlook on medicine may never be the same. |
| Name | Character | Episodes |
|---|---|---|
| Beth Riesgraf | Samantha Ellison | 10 |
| Jason O'Mara | Dr. John Ellison | 10 |
| Lauren Stamile | Dr. Bridget O'Neill | 10 |
| Jessica Szohr | Gretchen Polk | 10 |
| Chris Chalk | Darius Bishop | 10 |
| Jacob Vargas | Ramon | 1 |
| Eric Edelstein | Jed | 1 |
| RonReaco Lee | Quentin Harper | 1 |
| Justin Miles | Seth | 1 |
| Christine Horn | Sherry Perkins | 1 |
| Tim Peper | Kyle Hawkins | 1 |