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 it is, in fact, Men in Black, which has to its universe three movies, an animated series, and some comics.

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

In Canon
The Men in Black started off as a comic series created by Lowell Cunningham. The comics showed a secret organisation dedicated to suppressing and monitoring paranormal activity on Earth while preventing the general public from learning of the existence of aliens. Its Agents are referred to by letters, and sever all ties with their former lives (all their records are deleted) upon joining the agency. One agent went rogue after realising that the agency was keeping aliens hidden so that they could manipulate and reshape the world. However, the film franchise seems to have deleted this plotline altogether, and the Marvel comics that accompany the films reflect that.

The film franchise of the Men in Black is closer to the PPC in terms of comedic elements. Instead of suppressing alien activity, the film version of MiB merely monitors aliens and prevents them from posing any significant threats to human life on Earth. According to the first film, the organisation was founded in the mid-1950s as a government agency devoted to making contact with extraterrestrials. Earth was made, upon first contact with alien species in 1961 outside New York City, into an apolitical planet where alien species may take refuge, provided they adapt to a human-appearing lifestyle and do not raise the suspicions of the native population. The MiB were then turned from a badly-funded government organisation to an independent entity funded by patented alien technologies that they appropriate from their extraterrestrial refugees, including things like liposuction and velcro. They are devoted to monitoring aliens who have taken refuge on Earth, and intervening when the public is made aware of alien activity or when aliens threaten the Earth.

This has led to, naturally, one threat to the Earth per movie released, the most recent one involving a heavy amount of time-travel in order to resolve. The films follow the exploits of Agents Jay (no, not that Agent Jay) and Kay (alternately styled 'J' and K') and their efforts in stopping said alien invasions.

In Fanfiction
MiB is, due to its nature as a secret organisation involved in monitoring extraterrestrial life, often crossed over with continua such as Doctor Who/Torchwood and the Avengers. Often, crossovers with the Avengers will imply that Phil Coulson and Agent Kay are related. Sues in this continuum are likely to be Agents themselves as well as romantic interests of Agents Jay and Kay, despite regulation against fraternising amongst Agents.

MiB and the PPC
Due to the numerous similarities between the MiB and the PPC, missions in this continuum are likely to be extremely sensitive ones. After all, this continuum is home to the neuralyzer, a key tool for both MiB and PPC agents. MiB HQ also contains a de-neuralyzer, which implies that any neuralyzed memories of PPC Agents are in danger of being recalled, should the canon characters choose to use it in that manner.

Breaking into MiB HQ to de-neuralyse a PPC Agent is probably a Very Bad Idea, as MiB HQ is probably extremely well-equipped to deal with things like random PPC Agents popping in to use their tech, and as previously mentioned, the tool that would make the MiB Agents forget that the PPC Agents were even there originated from the MiB continuum in the first place.

On a lighter note, however, MiB Agents use chocolate milk to cure headaches relating to temporal fractures, similar to how PPC Agents use Bleepolate milk to alleviate headaches relating to Temporal Distortions.

Agents Native to this Continuum
[Any Agent that transfers from MiB to the PPC would probably already be well-equipped to handle the PPC workload, just saying.]

Agents Specialised in this Continuum
Agents are considered specialised in a continuum when they have handled at least three missions in the canon. Most of these agents are also active/specialised in other continua. It is often not the agents who decide where their specialty lies, but the Flowers that keep assigning missions to them.

Agents Not Yet Specialised in this Continuum
Agents with fewer than three missions in this continuum are not specialised, yet. They probably soon will be.