All time most powerful:

THE SECRET WEAPON. I get mad when Ben resorts to this, as it is a form of nuclear warfare.

THE BELLY: The other person attached to Ben. It fills up the entire universe plus a few black holes; if he moves in the wrong direction, it tends to block out the sun. It has made us a family of six, as it is a distinct and separate entity.

CALLIE our dog: She can clear out the entire house, and not even realize she's the culprit.