I like this week's contest because I did not know the answer and gave myself three minutes to come up with something..anything.

My guess is the common trait for this list of heroes is each has/had his own "Kryptonite". Wonder Woman cannot have her hands binded. Aquaman can only survive without water for a limited time. Zatanna cannot cast a spell if she is gagged and cannot speak. And so on.

Tomorrow Woman and Ralph were the ones that stumps me. I can say T.W was a bomb and if it exploded- talk about a weakness! Ralph? Hmm.. he would be powerless without his juice (forgot its name).