Men in Black

Saving the universe from a threat, lots of shiny weapons, a hidden headquarters, black clothing?

This almost sounds like the PPC, but this is in fact the Men in Black, which has to its universe two movies, an animated series, and some comics.

The basic premise of MIB is saving the Earth from alien threats, and keeping the existence of aliens a secret to the general public.

It is also home to the neuralyzer, a key tool for both MIB and PPC Agents.