[s4e4] Nuke Kids On The Block -

When the leak worsens, Walter is forced to launch the warhead into a remote area to prevent a catastrophic explosion on-site.

At the end of the episode, Happy reveals to Toby that she wants to have a baby.

To plug the leak, they use a 3D printer and neon gas to create a custom plug.

Paige confronts Happy about constantly "third-wheeling" on her dates with Walter. This tension persists throughout the mission until the two are forced to work together to save an unconscious Walter.

The launch arms the live warhead, and Happy must disarm it at the last possible second. Character Arcs & Personal Drama

The episode's premise is based on a at a Titan missile silo in Damascus, Arkansas, where an airman accidentally punctured a fuel tank with a dropped socket wrench.