What is it and can it be copied. Please answer here of if its ok with you send me message because im inbetween classes now and i wont see right away. Thank you

Check out the Players Guide under units

When a member of character uses this team ability rolls doubles on the dice on a successful attack roll, the target is not knocked back. The attack deals damage normally. If the target has zero or one action token after the attack has been resolved, give the target an action token.

and yes, it can be copied.

It makes critical hits have the possibility of being extra nasty and doing two extra clix of damage.

i always love usinit with a wildcard that has flurry. noing worse then using flurry and roll dbls on the first hit, with no other target !

It came in handy when my Invincible went up against FCBD Iron Man - Iron Man had blasted Invincible for 3 damage so he ended up on his Charge/CCE click. Since Iron Man was still on his top click, I figured I may as well Charge him as I would only do 1 damage anyway, then I could use CCE next turn to break through Iron Man's Invulnerability.
I happened to roll doubles on the attack though, and I thought 'man... now I have to Charge him again..." until I remembered the TA. Iron Man was instead pushed past his Invulnerability, and suddenly he was an easy target.