If I have click who is a wildcard that is copying the Fantastic four ability and is using the card. I copy R Invisible girl's 18 defense, and I try to heal my wildacrd, does he/she still have the 18 defense, or can I shut off the wildcard ability then use support then turn it back on?

you could just ignore the replacement value if it's higher, or have Alicia Masters share her "10 DEF" with your Wildcard to make him/her easier to heal (alici is used in the example as the FF member having the lowest def value but you could use any FF/WC char that has a lower def than the char you try to heal, as long as you have a FF with the alt TA in play)

good one! never thought of inverting it like that.

Yeah; always remember that Team Abilities are optional. You can 'switch them off' anytime it suits you.

i have a quesstion that sort of involves this topic...if you have a wildcard thats copying team abilities, how often can you change it. Is it every action?? Like can you copy 2000AD to attack, than change to batman so you have stealth for your opponents turn??? thanks for the help.

They may change TAs every action. From the Universe PAC for Minions of Doom TA (although it is the same description for other Wildcards):

Members of this team act as wild cards. They can use any team ability that any friendly figure on the battle map possesses. They may use this ability once each action.