Gibbs and Abby in “Recovery”

Gibbs

Things odd, Abby? What's odd?

Abby

The bullet that killed Midge. It's nasty. It's like way nastier than any standard .32 I've ever seen.

Gibbs

It looks pretty standard to me.

Abby

Yeah, but look closer. It's covered in mold spores, and old mold, like sixty years, which means it's a very old bullet.

Gibbs

From where?

Abby

Well, my first thought is this assassin from the past. He stumbles through a tear in the space-time continuum.

Gibbs

Or from somebody's old gun.

Abby

That was my second thought.