Could Dr. Doom MM damage he recieved on to the Red Skull and then have the Red Skull MM that same damage further on to a thug?

Sure, why not. Damage transferred by MM is still damage dealt.

Nah, you can't. Mastermind says "when this character is the target of a successful attack..." If Doom MM's onto Red skull, he has to take it like the ####, skull-faced little man that he is.

Actually, MM says "when this character is dealt damage" so theoretically it should work, and you should in theory be able to MM earthquake damage as well.

Except Mastermind says to treat the new character as if it were the target of the attack, which is why the target of MM takes knockback.

And your "theory" is right on both.



For knockback, it is actually a little more vague than that.

The only FAQ that mentions an attack is:

(Which should probably be adjusted to account for the fact that MM damage does not have to come from an attack.)

That all said, MM does not require an attack for activation. It just requires damage to be dealt.