Jennifer Mary Sparks is a superhero in the WildStorm comic book universe created by Warren Ellis during his 1997 revamp of the Stormwatch series.

Most of Millar's additions are furthering Ellis's backstory and intermeshing Jenny Sparks with important historical figures of the 20th century, including Albert Einstein, Ernest Hemingway, Adolf Hitler, Jacques Cousteau, John Lennon, Princess Diana, and many others.

Left penniless, young Jenny was invited by her godfather, Albert Einstein, to Zürich, where he offered to finish her education.

In the 1960s through 1980s, Sparks is shown to have become involved with the first British bands of superheroes, but she encounters problems with some extreme personalities that disillusioned her to that role.

Despite those experiences, in the 1990s she agreed to join a new group called Stormwatch that had been formed by a man named Henry Bendix.

On 31 December 1999, Jenny Sparks knew that she would die at midnight as the 20th century ended, a fact known only by her teammate The Doctor.

She electrocuted the brain of an enormous alien creature, the "God" that had originally created Earth and which was planning to wipe the planet clean of all life.

During the Transfer of Power storyline, a magical version of Jenny appeared and temporarily removed all mechanical weapons from the earth.

[6] In Warren Ellis' 2017 reboot of the WildStorm properties following DC Rebirth, Jenny Sparks is reinterpreted as an aspect of a "Planetary defense system" created by aliens, complete with new powers.

[7] She is a techne – a spirit of the mechanical arts and crafts, empowered by the defining technology of her era, and created by unknown powers to defend the planet Earth.

The Jenny Sparks (2024-) solo series by Tom King and Jeff Spokes published under the DC Black Label imprint depicts Jenny again as the spirit of the 20th century and a former member of the Authority and Stormwatch, and otherwise broadly retaining her previous Wildstorm character history with some small changes.

The series sees Jenny working at arms length from the Justice League to try and apprehend an out-of-control Captain Atom.

She can apparently survive being transformed into other forms of energy, as when she travelled through a TV and power lines and then into a police radio.

A short-lived 2017 reboot of Jenny Sparks in The Wild Storm possessed the ability to travel between electronic devices, such as televisions, computers and smartphones.