my friends and I occasionally try the 2 headed mutant rules so we can play 4 players, but we have to be a little lax on the rules because there is virtually nothing. How would you guys answer the following questions.

is uniqueness checked against your team mates characters?

If my team mate contrls doom , can I play my cards that say you must control doom?

Are our locations concidered unique or can we have 2 doomstadts in play?

Can we marvel team ups our faction with our team mates?

cards like Fast ball special, can we each exhaust a char when playing it, of only from 1 side of the team.

I know there is nothing official about the 4 player rules, but just like to know if there is any basic consensuse on the rules.

The way I play:
-Uniqueness is not checked towards your teammate, so you can each have a copy of Dr. Doom.
-Cards that say you control, ie: Faces of Doom, only check for your characters, not your teammate.
-Each person can each have a copy of the same location, ie: my teammate and I can each have a Doomstadt in play.
-You can only use team-up cards on characters YOU control, not you and your teammate.
-You exchaust characters YOU control, not your teammate, for costs such as Fastball Special and Mystical Paralysis.

Hope that helps and I think there might be some official rules.

Check the Rule Book, it has like 4 paragraphs of rules for the 2 Headed Mutant, doesn't it? Also, these answers are from common sense.

1. I believe you and your teammate can each have the same location, but since you share the Front and Support Rows, Characters are unique towards your teammate.

2. Since you have the same Supprt and Front Rows, you also control Doom.

3. look at #1

4. Since you have the same Support and Front Row, then you can.

5. You both control the characters, you just play PTs and Locations by yourslef. Therefore you can.

Here's some things from the Starter.

Each team has 100 Endurance. Each player has his own resource row, but shares a single front and support row with his teammate.

Draw Phase: Everyone draws 2 cards.

Build Phase: Team with initiative builds first. Each player plays a resource, then each recruits characters according to the resources they have. They then use formation step, and then perform the formation step. Then other team builds.

Combat: Team w/ Initiative attacks, then the next team attacks.

Recovery: Each team recovers 2 characters.