Early Life

Tandy Bowen was born in Shaker Heights, Ohio, an affluent suburb of Cleveland. Bowen's mother, Melissa, was a celebrated and self-centered model who had become rich not only from her own career but also from receiving her previous husband's estate. Tandy's father had left for India seeking "spiritual rebirth." Subsequently, Melissa married Phillip Carlisle. Although kind, Tandy was still hurt by her father's leaving and did not accept Phillip. Her mother also neglected her.

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Feeling unloved, Tandy turned for affection to an older teenager named Rob Daltry. But when he left for college shortly thereafter, the despondent Tandy left home on a bus for New York City. While there, a man tried to rob her but was stopped by the homeless Tyrone Johnson. She bought him food and the two became friends.

Kidnapping and Experiment

Dr. Simon Marshall and his men rounded up runaways, offering them food and shelter. Naive, Tandy agreed, and Tyrone went with her, suspecting things were not right. There, they were knocked unconscious and injected with a designer drug the Maggia wished to use as a replacement for heroin. Because of latent mutant genetic factors and some magical interference by D'Spayre, Tyrone and Tandy survived while the others died due to the drugs' effects.They escaped, along with another prisoner, the Chinese human-carrier who would become Mister Negative, jumping into the river, and both began manifesting superhuman powers. They discovered Tandy could keep Tyrone in check. Marshall's men attacked, but were consumed by Cloak's hunger then hit with Dagger's light daggers.

Cloak & Dagger

The two became Cloak and Dagger, pledging to protect other young people from the dangers they had encountered. Tandy is fiercely loyal to Cloak. Even when offered to be reunited with her stepfather, she remained with Cloak.

Cloak & Dagger also teamed with Spider-Man and others to halt a murderous supervillain rampage led by superhuman serial killer Carnage; later, Dagger helped rescue the New Warriors from the supremely powerful Sphinx. She accepted an offer of New Warriors membership, though Cloak declined to join. Serving as a Warriors reservist, Dagger also undertook a single mission with the informal Secret Defenders group.

Cloak was manipulated by Nightmare into wanting to consume all lawbreakers. Dagger sought the assistance of Daredevil, Black Widow, Moon Knight, Shang Chi, Doctor Strange, and the Punisher. Eventually, Dagger was forced to use her full power on Cloak, which seemed to transfer his darkness to her, reverting him to normal. Cloak eventually regained his powers from Dagger and the two continued to adventure.

More recently, the secret criminal group known as the Pride tricked Cloak & Dagger into trying to retrieve their superpowered children. An encounter with these young Runaways soon convinced Cloak & Dagger of the Pride's true nature, but before they could act on this knowledge, the villains erased the duo's memories of the Pride. Cloak & Dagger continued to roam the mean streets, bringing the light of hope to the innocent and dark justice to the guilty.

Orderly Reginald Mantz managed to replicate Cloak's powers with Mutant Growth Hormone. He then beat Dagger and left her hospitalized. The Runaways and the New Avengers found evidence of "Cloak" acting this way and confronted the real Cloak and Dagger; however, they eventually discovered the truth. She and Cloak were able to regain their memories of the Runaways.

Civil War

During the conflict around the Superhuman Registration Act, she joined the Secret Avengers. She and Cloak were captured in a stratagem of Captain America to make S.H.I.E.L.D. trust his circumstantial ally Wilson Fisk. They escaped, were recaptured, and freed for the final battle. As the Negative Zone Portal was closed, Tandy convinced Tyrone to open a portal to Manhattan where the battle continued.

X-Men

Dagger under the control of Mister Negative

At some point, Cloak and Dagger were active in Colombia, destroying drug plantations. The drug lord hired Iron Patriot via the H.A.M.M.E.R. to take them down. Instead, he recruited them into his own X-Men, and used them against San Francisco rioters and Stephen Lang's Bio-sentinels.

When Emma Frost and Namor eventually revealed their true allegiance, they asked Cloak and Dagger to stay back and, following the traitors to the newly built mutant nation of Utopia, were presented by Cyclops as being part of his plan from the beginning so they would be accepted in the community.

Later, she was one of those who convinced Cyclops that his attitude toward Deadpool (rejecting him from joining Utopia's X-Men) was kind of hypocritical.

Spider-Island

Cloak and Dagger's powers were switched thanks to Mr. Negative during the events of Spider-Island: Cloak now provided the light, while Dagger provided the dark, and had to feed from Cloak's light energy to temporarily satisfy her cravings. It was also foretold that Dagger would be the one to eventually kill Mr. Negative.

All-New, All-Different

Although Martin Li was arrested at some point, Cloak and Dagger had been using Shade patches, which dosed them with a drug that stimulated the effects of Negative's touch, ensuring that their criminal personas would 'remain' loyal to him. Breaking him out of the prison ship where Li was being kept they restored him to Mister Negative to lead an assault on Parker Industries in Japan. Although Peter was able to escape being corrupted by Negative thanks to Negative's prior corruption of Spider-Man, Cloak and Dagger managed to help Negative escape when Peter tracked them to his Hong Kong headquarters by secretly placing a Spider-Tracer on Cloak. Using this tracer, Peter was able to inject Cloak with a cure for Shade that he later used to cure Dagger, apparently restoring their original powers. Although Mister Negative had escaped, Cloak and Dagger decided to remain in Hong Kong to guard it from any future attacks.

Absolute Carnage

During Carnage's rampage with his Cult of Knull, Tandy and Tyrone were recruited by Iron Fist along with some other heroes in order to rescue Misty Knight who was being chased by Demagoblin and Carnage's Hive in the sewers. The heroes entered the sewers and looked for Misty Knight, with Dagger fighting off many of Carnage's symbiote minions. After a long time fighting the waves of symbiotes, the team found Misty as she was about to be killed by Demagoblin and the Man-Wolf. The heroes managed to defeat Demagoblin and made Man-Wolf to free himself from Carnage's control.Dagger and the other heroes were later brought by Cloak to the final battle against Carnage's horde.