As a married couple, both Frank and Leslie Dean were exiled convicts from the planet of Majesdane. As aliens, they had the natural ability to absorb solar energy. This solar absorption gave them both the ability to fly, fire energy beams, create shields and bonds. They were also bursting with colourful light, appearing to be humanoids made of light, energy and colour.
Together they settled in Hollywood, and through the use of a metallic substance they could repress their natural alien abilities in order to live among the human population. By purchasing a property without any surrounding buildings or neighbours, they were free to use their powers in private without being observed. Both Frank and Leslie created a public persona of themselves which was extremely clean and caring. They were popular actors on General Hospital who were also vegan and preferred to listen to music from the 60's, including The Beatles. This false persona was so strong and believable that nearly twenty years later their own daughter would refuse to believe that they were capable of murder, stating that they don't even eat meat.
Together, Frank and Leslie were off set reading through a script when they were summoned by The Gibborim. They were instantly teleported to the underwater Vivarium where 10 humans had also been gathered. Although Tina Minoru recognised them from General Hospital, Geoffrey Wilder threatened to shoot them if it was part of some publicity stunt. This prompted Leslie to reveal her alien powers in self-defence, yet Frank did not revert to his alien form. The foray continued to descend until The Gibborim appeared before them.
When The Gibborim made the offer of 25 years of unlimited power over Los Angeles and the possibility of immortality, they classed Frank and Leslie Dean as "The Colonists". They agreed to have their powers enhanced, and the chance that they would be among the six offered immortality after The Gibborim destroy the Earth. As such, they became founding members of The Pride. Neither Frank or Leslie bothered to deceive the other Pride members with their public persona, and were comfortable enough around them to show their true cruel characteristics.
After Victor and Janet Stein announced that they were pregnant and intended to give their chance of immortality to their child, the Deans also hoped to have a family. Soon they had a baby girl, Karolina Dean, who had inherited her parent's solar based alien powers. In order for Karolina to grow up as a normal human child, they had a medical bracelet created from the same metallic substance that suppressed their own alien abilities, and it was agreed that they would not reveal anything about her true nature of The Pride until her 18th birthday.
In the off-chance that something should happen to them before Karolina's 18th birthday, the Deans drafted a Last Will and Testament. The last page of which contained a symbol which indicated the removal of her medical bracelet. The will was found by Chase Stein on the night that the Runaways observed The Pride murder a young prostitute in the Ritual of Blood. Karolina, who had not seen the Ritual, still refused to believe her parents were capable of murder and ripped the bracelet off in a fit of anger and inadvertently unleashed her alien powers.
Karolina believed her parents had flown to New York for the reading of a Broadway play, but they were actually brokering an intergalactic arms deal. Therefore Leslie and Frank were unable to prevent Karolina from discovering her powers. When the other members of The Pride called them to inform them of events only Leslie returned to Los Angeles, while Frank remained to complete the arms deal.
By the time Frank had returned to California his daughter had already knocked Leslie unconscious and gone into hiding. His arrival at the Minoru residence was angry and loud, as he use his powers to blast Victor Stein in the stomach. He only powered down after the threat of the Minoru's black magic, and he eventually calmed down after Geoffrey Wilder revealed his plan to blame the murder on the Runaways.
Betrayal & Death
A year before the Runaways ran away from home, both Frank and Leslie Dean had begun to conspire with Alice and Gene Hayes. The Hayes were mutants, classed as "Outcasts" by The Gibborim. Set aside from the rest of humanity, they did not consider themselves to be human and therefore bonded with the Deans. Together, the four adults realised that instead of just giving their children the chance to become immortal, they could join them.
The pact with The Gibborim meant that six out of the twelve members of The Pride would become immortal. Together the Deans and the Hayes realised that if they were to remove the remaining eight members of The Pride, then they could become immortal along with their children, Karolina and Molly. However, realising that the future of The Pride was already recorded in The Abstract they set about decoding their own copies. After they had identified which pages revealed their treacherous plot, they silently broke into the houses of the other Pride members to remove those pages from the other four copies of The Abstract.
While breaking into the Wilder residence, they were silently observed by Alex Wilder. Discovering their scheme to murder his parents, Alex began to form a plan of his own. Like the plan of the Deans and Hayes, Alex's plan would guarantee immortality for his family, and for the Minoru family, as he had fallen in love with Nico. However, Alex's plan begun to fail when Nico rejected him. The Gibborim were angered when their human soul was released before they could devour it, and turned their wrath on all The Pride and the Runaways. As a last act of familial loyalty, the Pride used their powers to hold The Gibborim back while their children escaped.
Frank Dean has not been seen since the Vivarium was destroyed in an underwater explosion. Both he and his wife have been presumed dead.