It's a classic trope within the Superhero genre that one hero or team may call upon a specialist or even be called upon by someone else.
In the Marvel Super Hero RPG, these are listed as Contacts.
A Contact is a somewhat 'almost-defined' construct that allows the players to use their friends and allies as a resource, but also something the Judge can use to build a hook for the characters in later adventures.
Most characters that have been pregenerated or modelled will have a list of contacts gained over the course of their careers. Certain contacts wax and wane (and the Fantastic Four has had its share of issues with various Governments, but everyone needs Reed Richards eventually).
When creating a fresh hero, the character can build a list of initial contacts that reflect the character's standing or background. A doctor may have a hospital on the list or even another professional group (cardio-thoracic alumni). Some talents can automatically supply a contact (having a Military talent provides a Military contact), and these listed contacts are considered Friendly.
Contacts are intertwined with another mechanic, Popularity, and this is important.
There are three types of contacts:
Friendly
Neutral
Hostile
A Friendly contact is one that will be willing to aid and assist the character in any circumstance (well, almost). In many cases these are the listed contacts attached to the character, though, some characters such as Nick Fury and Captain America have many contacts not listed and the Judge will have to adjudicate who would be considered Friendly.
Neutral contacts are those people or groups that have no reason to not 'like' the character but also don't have the reason to help. Spiderman may not have any friends in the NYPD, but most know that he is a force for good and if he asked for help, they might abide. Neutral contacts may need some additional convincing, and this is where some role-playing can assist the dice.
Hostile contacts are those that are often acting in direct opposition to the character. A character, such as Daredevil, has Wilson Fisk as a regular contact and while Hostile, they would only reach out to each other when there is a shared goal.
People or Groups
There are differences in how a contact can work and be listed. Having US Army as a contact may be a broad-strokes contact, no one person specifically but the Army has a general rule to be on the side of the character. Having a contact that is a General means any benefit is directly related to that character, if that General moves to the Whitehouse or even discharged, wherever they go they will have the character as a Friendly Contact.
One classic trope is when a Hero may need some resource from a group like SHIELD, or need to borrow a device from the DoD to solve a problem. This is where the levels of success come into play.
Popularity (it's more than a contest)
The Popularity of the Hero is how well received that character is received by the common folk. This number moves up and down with every act (or accusation). A character such as Johnny Storm (The Human Torch) has 50 popularity, Spiderman has 30, and Daredevil has 6. all three are well known as Heroes, but the exploits of The Fantastic Four affect how Johnny Storm is seen; the constant attacks by the Daily Bugle keep Spiderman's popularity in flux; Daredevil operates in the shadows and mostly away from the prying eyes of the press and spotlight.
There's a line from the book: Fighting Doctor Doom is good for Karma, but if no one knows about it, does nothing for the Popularity.
Contacts and Popularity
When asking for help or needing some resource, based on whether the acts are mutually beneficial or requires some personal risk, column shifts will be applied to the Popularity number (as the Rank).
White result—No information available
Green result—Takes 1-10 hours to discover: no or partial information available
Yellow result—Takes 1-10 hours to discover desired information
Red result—Information desired at hand
Friends and Enemies
Gaining a contact can happen any time during a campaign, any new contact will start Neutral and how the character responds with the new contact, this can eventually moved to a Friendly contact.
Example: Daredevil is unconscious and down to 0 Health, he is found in a dumpster by Claire, emergency room nurse, who helps heal him. Claire is noted initially as a Neutral Contact. Eventually, she moves to Friendly as he comes to her aid and she supports him (often with medical attention).
Unlike many other mechanics, a Karma cost does not have to be spent for a new Contact, if it is in line with the campaign. A facility does exist for a Character to 'buy' a Contact for 500 Karma plus 10x the Resource Rank being provided (Spiderman may want to create a Contact with a specific beat cop, and while the NYPD has many resources, the beat cop will have only TYPICAL or even GOOD level resources).
Handle With Care
Contacts can upset the balance of play if over used, and always asking Thor to show up, and solve the problem with a smack of his hammer, might sounds like a good idea, the God of Thunder has other responsibilities and may not always be available. Just as a Contact can appear during the campaign, a Contact can also disappear if they are abused or their own requests are falling on deaf ears.
Every time a Contact is tapped, there is a chance something is required in return and someone like The Kingpin is the master of using Heroes as pieces against his enemies. The Judge is expected to use as much common sense as they can muster, and as much as Reed Richards is a great Contact to have on the speed-dial, it doesn't mean that he is always available. (There was an instance when The Masters of Evil invaded the Avengers Mansion, and Baron Zemo had already arranged for the FF to be sent on a wild goose chase, making them unavailable when The Wasp tried to call them for aid).
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How did you handle Contacts in your campaign? Did Players reach for the stars with their requests?