Marston was the creator of the systolic blood pressure test, which became one component of the modern polygraph invented by John Augustus Larson in Berkeley, California. Marston's wife, Elizabeth Holloway Marston, suggested a connection between emotion and blood pressure to William, observing that, "[w]hen she got mad or excited, her blood pressure seemed to climb".
The "Year One" storyline retells Diana's origin growing up on Themyscira. She lives an idyllic life and harbors interest for the outside world, and the first connection to it comes in the form of Steve Trevor, who crashes on the island and is the sole survivor. A contest is held to determine which Amazon is the best candidate to take Steve home, with Diana volunteering despite knowing the cost to leave the island is to never return. Diana wins the contest and departs with Steve. Once arriving in America, Diana is taken into custody by the government to discern her origins. She meets Etta Candy and Barbara Ann Minerva along the way. While incarcerated Diana is visited by the gods in animal form and bestow upon her powers of strength, speed, agility, durability, and flight. She discovers Ares, the god of war, is working to destroy humanity. Accepting her new role in Man's World, Diana, with the help of the gods in animal form, subdues Ares with the lasso. Now called Wonder Woman, Diana becomes one of the world's greatest heroes.
In the "One Year Later" storyline, the witch Circe places a spell on Minerva that allows her to change her appearance from human to Cheetah at will, even though she still remains in her Cheetah form in either guise. She controls three actual cheetahs and still possesses her super-speed, which is demonstrated by her ability to steal the golden lasso away from Donna Troy several times in battle. She is later seen in the Justice League of America Wedding Special, forming a new Injustice League alongside Lex Luthor and the Joker. She also appears in Salvation Run. Later still, in Final Crisis: Resist, she joins forces with Checkmate to rebel against Darkseid, and enjoys a brief relationship with Snapper Carr. In the pages of Wonder Woman, she is revealed as the power behind the Secret Society, responsible for the creation of Genocide. She arranges to have her ally Doctor Psycho take the place of Sarge Steel as director of the Department of Metahuman Affairs which, in the middle of Genocide's onslaught, she targets for destruction.
Olive Byrne met Marston in 1925, when she was a senior at Tufts; he was her psychology professor. Marston was already married, to a lawyer named Elizabeth Holloway. When Marston and Byrne fell in love, he gave Holloway a choice: either Byrne could live with them, or he would leave her. Byrne moved in. Between 1928 and 1933, each woman bore two children; they lived together as a family. Holloway went to work; Byrne stayed home and raised the children. They told census-takers and anyone else who asked that Byrne was Marston’s widowed sister-in-law. “Tolerant people are the happiest,” Marston wrote in a magazine essay in 1939, so “why not get rid of costly prejudices that hold you back?” He listed the “Six Most Common Types of Prejudice.” Eliminating prejudice number six—“Prejudice against unconventional people and non-conformists”—meant the most to him. Byrne’s sons didn’t find out that Marston was their father until 1963—when Holloway finally admitted it—and only after she extracted a promise that no one would raise the subject ever again.