When I hear Planetary Defense I think Doctor Who and U.N.I.T. or several other sci-fi franchises. But this is NASA in real life, protecting the planet from another Extinction-Level Event in the form of a big hulking rock slamming into Earth at trans-orbital velocities. You can follow them on Twitter if you want to keep track of what might be headed our way, and learn about the next step, the Asteroid Redirect Mission.
