Oliver lived, ate and traveled with the kangaroos, developing a leaping ability that rivaled the animals he studied.

[2] Seeing an opportunity to make money, Oliver decided to parlay his new-found leaping abilities into a boxing career.

Harrow wanted to use the Kangaroo as muscle, but the newly empowered superhuman refused and left to pursue Spider-Man.

Forced by Dr. Harrow to obey or suffer agony, the Kangaroo returned and was then ordered to retrieve a radioactive isotope.

Refusing to listen to his enemy, the Kangaroo burst into the room which held the isotope and was reduced to a pile of ashes upon exposure to the radiation.

[4] Some time after his death, Arnim Zola recovered some of Oliver's DNA and created a proto-husk of the deceased villain.

He was first mentioned as an active operative of the crime-organization Corporation opposed by a variety of superheroes including Luke Cage, Iron Fist, Captain America, Hulk and others.

Although not from Australia, Hibbs idolized the original Kangaroo, going so far as to spend years studying Frank Oliver's exploits and begin imitating his predecessor's speech and style.

To better prepare himself to avenge his idol, Hibbs secured a job working for the Corporation as one of their agents, based out of Taylor, Mississippi.

While bounding through New York City and shouting for people to get out of his way, Hibbs was knocked out by a single punch from Spider-Man who swung away literally laughing about the situation.

[9] After escaping from custody, Hibbs then spent a sizable amount of his trust fund to purchase a suit of armor from the "Sharper Villain Catalogue".

The kangaroo-themed armor enhanced his strength and leaping ability, as well as provided him with a semi-prehensile tail and a pouch-level cannon.

After resolving their internal strife, the Spider-Man Revenge Squad then sallied forth, with the Kangaroo wearing polka-dotted shorts instead of his armor's destroyed bottom half.

Taking the name Billy Bob Jenks, the Kangaroo becomes a professional baseball player until his identity was revealed, resulting in his expulsion from the major leagues.

[12] Turning back to the supervillain path, the Kangaroo then found himself incarcerated in the Cage, a prison where superhuman powers are dampened.

[13] During all of this activity, Hibbs's mutation was rapidly advancing, as he gained bulk, growing to nearly nine feet in height, suffered facial deformity, and decreased in intelligence.

However, this turned out to be a trap set by Tombstone: the ductwork was too narrow for the Kangaroo to squeeze into, resulting in Hibbs being stuck halfway out of the ducts.

[18] Kangaroo is later captured by Alyosha Kravinoff as part of his zoo of animal-themed super-beings before being presumed dead when his ship sinks.

[19] During the "Ends of the Earth" storyline, the Kangaroo appears alive and assists Spider-Man in stopping Otto Octavius' satellites.