Two young men calling themselves Thunder and Lightning were causing major disturbances in St. Louis with their super-powers. The Titans were summoned to deal with this menace. After a short battle, the Teen Titans learned the two brothers - Gan and Tavis Williams - were searching for their father, Second Lt. Walter Williams. Thunder and Lightning revealed that they are the offspring of American soldier Walter Williams and a Vietnamese mother. As children, they began to manifest strange abilities, controlling thunder and lightning. A wise China man named Chan To urged the brothers to seek out their father - he sensed that was the key to harnessing their sometimes-uncontrollable powers.
Wonder Girl discovered that their father had been missing for almost 20 years, following a laboratory accident. The brothers decided to settle at S.T.A.R. Labs, where, hopefully, they could learn to control their powers more efficiently.
A few months later, the Titans and S.T.A.R. Labs tried fruitlessly to find a cure for Thunder and Lightning's powers. At this time, Raven used her soul self to learn more about their missing father through Gan and Tavis' subconscious. Raven unlocked the secrets of their origins: The man who called himself Walter Williams was actually an extraterrestrial; his ship crashed in Vietnam 600 years ago; He returned to the crash site under the guise of Walter Williams to retrieve his spaceship. There, he met and fell in love with the Vietnamese woman who would be Thunder and Lightning's mother. Now, with Raven's help, the Titans and Thunder and Lightning were able to locate the alien father, who was being held prisoner by the H.I.V.E. The H.I.V.E. had been holding the alien prisoner for years, exploiting his knowledge and abilities for their own purposes. Under the H.I.V.E.'s control, the alien attacked the Titans and his sons. The battle ended tragically: Thunder and Lightning were forced to kill their own father.
With their father's blood sample, however, S.T.A.R. Labs was able to cure Thunder and Lightning, allowing them to control their abilities at last. After this, the brothers returned to their motherland. Sometime after this, the brothers returned to S.T.A.R. Labs, still searching for ways to rein in their powers.
The brothers eventually relocated to the S.T.A.R. Lab located in San Francisco. As Gan and Tavis learned to master their abilities, they also provided security for S.T.A.R. Labs.
While stopping a robbery, Thunder and Lightning came into conflict with Raven, whose dark soul had been reborn in the image of her father. Raven was trying to plant the demon seeds of Trigon's unborn children into suitable host bodies. Raven sought out Thunder and Lightning and used their bodies as hosts for these seeds of Trigon.
It appears as though Thunder and Lightning were able to free themselves as well. They have since appeared to aid the Titans during their encounter with the Justice League, who were trying to stop former Titans member Cyborg (formerly Cyborg, then transformed into Cyberion)
Freed from the evil influence of the seeds of Trigon, the super-powered Thunder and Lightning have returned to their home country in Southern Vietnam, reportedly to defend it from an unknown alien threat
Thunder was sent to planet Salvation. While trying to help the Martian Manhunter, he was captured by Bane. Lex Luthor used him to power the teleporter. Thunder was presumably killed when the teleporter exploded.
Powers & Abilities
Thunder is able to control thunder, which he manifests as rumbling noise, which he can control to varying degrees. Gan also possesses super strength.
He also shares a psychic link, and is able to communicate telepathically with his brother.
Thunder appear with Lightning in the teen titans animated series. In the show they are seemingly supernatural brothers who just want to have fun, but they make life miserable for everyone else with their disregard for the safety of others. Their powers are thunderous sound blasts and lightning bolts respectively. When they combine their powers, they can cause rain. Thunder is rather large, has a deep voice, and wears blue samurai armor.
Slade, tricked Thunder and Lightning into setting fire to some posts which created a giant fire monster bent on destroying the city. It was stopped when Thunder and Lightning joined their powers to make it rain, therefore putting out the Fire.