Fawcett's Finest: Lightning Lasses

A striking parallel between Earth-S and Earth-Two is the lightning lasses who appeared on the scene in the early 1980's. The Jonni Thunder on each world gained lightning powers through different means, channelling ancient sources that tapped into energies fouind in the Marvel Family and the Thunderbolts of their individual worlds. The Earth-S Jonni became the evil Chain Lighnting, who was a one-time foe of Mary Marvel, even stealing her abilities temporarily.

The Earth-Two private investigator Jonni became the heroine Thunderbolt, until the actual dormant personality within the energy entity took control and revealed evil intent herself. Indeed, both women's careers were brief, like a bolt of lightning from out of the blue!

As for the origin of the Thunderbolt known as Mzzttexxal* who merged with the good Jonni, that creature was one of a small race of elemental beings who journeyed to Earth-Two aeons ago. Discovering that within that world's atmosphere, they could not manifest their own physical bodies due to the the electro-magnetic pull around the globe, they stored their electic-bodies within statues they created. Eventually, they hoped that humans would discover these, and these entites could merge with homo sapiens to spawn a new life form to dominate the world.

In fact, that began to happen in the early 1940s, when a Brazilian tribe came across three such statuettes, unleashing the energy beings and sending them against the visiting Johnny Thunder and his adopted daughter Peachy Pet. These beings, like their sister Mzzttexxal, were protective of the humans whom they joined... yet adversarial against others they saw as a threat. The most prominent of these beings was defeated by Johnny's own Thunderbolt, an alien entity from the Thunderbolt Dimension only superficially the same as the Brazillian's Thunderbolts.

On Earth-One, Beatriz da Costa was a Brazillian businesswoman in charge of Wayne Enterprises' branch in her country. She also was secretly the superheroine known as Green Fury, who had power over the elements as Green Fury which she used against other elemental adversaries from her world's version of the Brazilian tribe which Johnny encountered. Unlike the malevolent yellow Thunderbolt who tormented the Thunder family, Green Fury was a benevolent protector of all and later became a member of the Global Guardians. Back over on Earth-Two, Beatriz' counterpart Mariana de Las Cordilleras resided in neighboring Columbia, until she was reunited with her long-lost brother Hop Harrigan and became heiress to his All-American Aviation Company.

* Although Mzzttexxal was a female while her Earth-One counterpart Ulthoon the Tornado Tyrant was male, the masculine Yellow Thunderbolt of Brazil had a female doppelgänger on Earth-One in Beatriz “Green Fury” de Costa. Thus balancing out the male/female quotient on both worlds.