Cloak and Dagger are runaways: two lonely teenagers who ran away to New York City to seek a better life. Fate, however, had other plans for them.
They were created by Bill Mantlo and Ed Hannigan. They made their debut appearance in Spectacular Spider-Man #64: March, 1982.
Tandy Bowen grew up in Shaker Heights, Ohio, the daughter of a multimillionaire and his trophy supermodel wife. Her dad abandoned the family while Tandy was very young, and her mother was too busy with her career and social life to pay much attention to the girl. Even her boyfriend forgot about her as soon as he went to college. Feeling empty and alone, Tandy boarded a bus for New York City with dreams of becoming a dancer.
Tyrone Johnson, or Ty, had a very different background. Ty was raised in the slums of South Boston, Massachusetts, and had been born with a speech impediment. When his best friend died because Ty was unable to say the words that might have saved him, the distraught teenager fled his hometown. He ended up in a bus station in Manhattan, hungry and ready to turn to stealing to eat.
The two teenagers met up after Tyrone thought about stealing Tandy's purse, but was ashamed when she offered him money. A thief then stole her purse, and Ty recovered it for her. Afterward she bought him dinner, and the pair became fast friends.
A Maggia chemist named Simon Marshall was luring homeless people to his lab with promises of food and shelter. Instead, he used them as test subjects for his new drug which had killed everyone injected with it.
Tandy accepted his offer, not knowing what was in store for them. Tyrone went along with her, sensing that something was wrong. The pair were caught, knocked out, and injected with the drug D-Lite, a heroin substitute. They managed to survive, and somehow became empowered.
They used their new found powers together to defeat their enemies. Cloak disorients them using his control of the dark dimension and Dagger finishes the job with her daggers of light.
Despite having powers, they still had no place to go. They ended up moving into a church where Father Delgado resided.
Recently, the duo aided Captain America and the Secret Avengers in Civil War.
During Dark Reign, The Iron Patriot aka Norman Osborn tracked down Cloak and Dagger to be on his team of Dark X-Men.
They initially refused but Norman said they either join and get cleared of their past, or don't join and get arrested, they realized they had no choice but to join.
Now under the command of Emma Frost, as it is her team, she tells Cloak to make a portal to where the rioting mutants are. The Dark X-Men stop the riot, and return to base with the Dark Avengers waiting for them pretty angry that they aren't getting any action and a fight between them starts, which is quickly stopped by Emma. Then they get a second mission to find Trask and the people he has infected.
The team has recently learned that they are not mutants but their powers are solely due to the drugs they were given.
During the events of Spider-Island both Tandy and Tyrone switched their Dark and Light powers. Their current situation is unknown.
Earth - 1610: In this reality Cloak is a woman whom is friends with a female Dagger. These two were shown inside of a police station, who they really are is unknown.
Cloak and Dagger of the Ultimate Universe have appeared in Ultimate Comics: Spider-Man Vol.2, they first appear as a team in the story arc "Spider-Man No-More!" battling against Bombshell, looking for answers about Roxxon, the company who experimented on them and turned them into what they are.