Major Story Arcs
Brilla and Maggie Session are the Session Twins, infamous dangerous (and expensive) adventurers and killers.
They are hired by the Grendel-Khan, Jupiter III, to find Grendel-Prime, the hero of a previous era who has been in hiding for generations. He hopes that Grendel-Prime will be able to prop up his weak leadership. Hearing of this, the rebellious Wyotek Jones hires the equally notorious Hitchcock Blue to find Grendel-Prime first. Hitchcock Blue seems to have an especial rivalry with Brilla.
The Sessions search for Grendel-Prime for over a year. They find out that he is working with Dr. Creach, and interrogate Creach's former assistant and lover, Joshua Radick. From him they find out that Creach and Prime are based in New York.
They finally find him and break into their base, where they see Grendel-Prime in a mysterious machine. They shoot the machine, causing it to malfunction, and sending Grendel-Prime into the past (where he confronts Batman in the second Batman/Grendel crossover). Since, they believe he was destroyed, however, they tell Jupiter III they will accept a reduced fee of only two billion dollars for their services.
Powers and Abilities
The Session Twins are famously skilled and dangerous warriors. They are known for their sadism.
Brilla uses a cat-o-nine-tails whip and also carries conventional high-tech ranged weapons like guns. Unlike her sister, she does not have a robotic arm. She does, however, have sharpened, animal-like teeth.