Powers: None on his earth of origin (Earth A). When this Jack Hart travelled to Earth-616 through Albert E. DeVoor's Atomic Resequencer, his molecules were realigned on an atomic level to match the structure of that Earth's (Earth B) Jack Hart (Jack of Hearts). Therefore, he possessed all the powers that Jack of Hearts of Earth-616 possessed.
Bio: Was one of the characters in She-Hulk #21 that travelled from Earth A (his Earth) to Earth B (regular Marvel Universe) on a vacation as his Earth B counterpart. Was eventually discovered and with the help of Jennifer Walters, She-Hulk (Earth-721) and the Mr. Fantastic's of Earth A and B, was sent back to his dimension of origin.