February 5–12, 2006.
A young paramedic (Kyle Chandler) arrives at Seattle Grace with a live, unexploded bazooka shell lodged inside a patient’s body. The patient, Hannah (Christina Ricci), had been handling the shell when it partially discharged. Any sudden movement or attempt to remove it could trigger an explosion.
The explosion forces the hospital to rethink safety protocols. The event haunts Meredith for seasons, contributing to her PTSD and near-death fixation. It also solidifies her bond with Derek and her colleagues.
Here’s a summary and key details about the famous “bomb episode” from Grey’s Anatomy :