Lois London was born to Katherine (later changed her name to Barbara) London, a music teacher, and Nick Brown. Its assumed that she grew up a normal childhood life with her mother and father. In her teenage years, she found out that her mother had married a lawyer, Carter Blair, and had a half-sister, Alison Blair.Surprised by this, she attended her sister's performance at Carnegie Hall. Lois and the rest of her family worked out their differences.
Curious as to how her sister was, Lois decided to get to know Alison. The two bonded at the start. Though she accepted Alison's mutation, she found being a mutant dangerous as they were attacked by Mystique, Rogue and their Brotherhood of Evil Mutants. Rogue once endangered Lois life, but was saved by her sister. Over the next weeks, Lois‘ had various headaches and even fainted a few times. Finally, as she took a walk to get some air while Alison performed in a club, Lois was attacked by a would-be mugger. She panicked, her hand started to glow and the mugger died, revealing that Lois had a mutation similar to her sister's. Lois went to Dazzler for help and Ali, with memories of her own murder trial still fresh, didn't think Lois would be treated fairly. The sisters decided to hit the road and travel to California. As people kept recognizing Ali, she disguised herself with a black wig. However, they were still followed, as somebody blackmailed them with photos of Lois and the mugger. The photo's had a phonenumber attatched to them. They called the number and were told that Lois and her sister had to break into a certain house and kill the man sleeping inside.
At night, they broke into the house and, after a short fight, it turned out that the owner was Nick Brown, Lois‘ father. After becoming a successful agent and financier, he had been paying his butler to track down Lois. The butler witnessed the death of the mugger and it was he who blackmailed the sisters into trying to kill his master, as he wanted to steal Brown’s fortune. Thanks to Angel's timely arrival, the crime was prevented and, with the pictures, Lois was easily cleared of all charges. They showed that she was actually defending herself and, fortunately, the crackling aura of energy was not even seen on the photos. Lois father granted the two sisters with fortune, buying gifts for Lois and getting Alison gigs at important events. Alison was put in danger on purpose by Nick to bring publicity for the songstress, Alison was mad and decided to leave her stepfather once and for all. Alison thought that Lois would leave as well, but she couldn’t. She felt that she needed somebody to protect her and Nick seemed the best choice.
Lois possesses the normal human strength of a woman of her age, height, and build who engages in intensive regular exercise.