Once a normal human named Nina Dowd, she was transformed into the catgirl Mighty Endowed upon touching an artifact she found on an archeological dig.
On an archeological dig, Nina Dowd and her assistant came across a metallic object half-buried amongst the rocks of the dig site. On touching it, Doctor Dowd was bound up in a cocoon and her assistant called for help. One of those responding groups proved to be the newly-formed Young Justice, consisting of Superboy, Impulse, and Robin. Doctor Dowd was freed from her crystalline cocoon by Impulse, who vibrated it to pieces, releasing the newly transformed doctor. No longer a normal human, she had become a being that now called herself Mighty Endowed. Now a catgirl in appearance, she also had increased the size of her breasts. Her ego swelled with power, she considered all those she saw to be beneath and was not threatened by the presence of Young Justice.
Unfortunately for the eager Superboy, Mighty Endowed defeated herself by the size of her assets; their weight made her fall over and unable to move.
