Mark Mardon

"Yeah, Clyde was no saint, but he was family. If you can't protect your family, the least you can do is avenge 'em."

- Mark to Joe West about the reasoning of his action

Mark Mardon, nicknamed Weather Wizard by Cisco Ramon, is the older brother of the late Clyde Mardon. After the S.T.A.R. Labs particle accelerator erupted, his plane went down. Mark was affected by the dark matter wave the same way as his brother, gaining the ability to control the weather. Mark was imprisoned in the S.T.A.R. Labs Pipeline but was freed by Leonard Snart and Lisa Snart along with the rest of the imprisoned meta-humans, and left with Roy Bivolo to become a member of the Rogues.

Early life
Mark had been taking care of his brother, since Clyde was 10 years old. At some point in his life, Mark along with his brother Clyde, became bank robbers.

In late 2013, Mark and Clyde robbed two banks in a single week; during the second robbery, Clyde shot and killed a security guard. Although the Mardon brothers got away, they also left enough evidence for the Central City Police Department to pursue. Barry Allen managed to deduct that they drove off in a Mustang Shelby GT 500 and used a farmhouse as a hideout. After Barry narrowed down the possible whereabouts to four farms, Detectives West and Chyre headed together to check on each one. Eventually, at the final location, they found Clyde, who shot Chyre while running to catch the getaway plane Mark was piloting. As they flew away, the S.T.A.R. Labs particle accelerator exploded and interacted with the ongoing storm, causing a lighting to directly hit the plane and blowing it up. His brother made it out relatively unharmed, though Mark's status had been unknown and generally presumed as deceased for over a year.

Vengeance on Joe West
It was much later revealed that Mark did survive the S.T.A.R. Labs particle accelerator explosion/the plane crash and had gained the same powers as his late brother, only that unlike Clyde, Mark broke almost every bone in his body during the incident, explaining his long absence. Upon learning the death of his brother, Mark returned to Central City to get revenge for Clyde's death. He first went to the Central City Morgue and asked the coroner the name of the cop who shot his brother; when the coroner refused to answer, Mark then tortured him with the form of hailing, using his weather powers. By the time the coroner finally caved in and told him Joe West was the one responsible, Mark promptly killed the battered informant.

Some time later, Joe and Barry Allen were driving when Mark sent a bolt of lightning down on them from the truck behind them in an attempt to kill Joe. Barry managed to run Joe to safety just in time. Mardon later confronted Joe in the Central City Police Department and once again attempted to kill him with lightning. However, he was stopped when The Flash and used the Wizard's Wand on him, but Mardon still managed to escape.

Joe and Eddie Thawne headed to one of the Mardon brothers's old hideouts, but Mark anticipated their arrival and kidnapped Joe using a gust of wind. He brought him to the pier and bound and gagged him before creating a tsunami to wipe out Central City, making Joe watch the whole time. However, the tsunami was dissipated by Barry, who was forced to run so fast that he traveled back in time, effectively erasing the events of the past few days.

With his future knowledge, Barry found Mark at his apartment and took him to the Pipeline at S.T.A.R. Labs, with him threatening to destroy the city with a tidal wave the whole time, effectively preventing Mark's future actions.

Personality
Unlike Clyde, Mark is the more mature and sensible of the two siblings. His anger is fueled by a desire for vengeance but he does not bear the inherent psychological mindset of a killer as his first inclination is not towards killing. That said - this does not negate his capacity for cruelty under incendiary circumstances.

In his quest for revenge - he wanted Joe West to suffer first - such that he created a tsunami with his weather powers to destroy Central City and to kill Joe's daughter, Iris, so that he would know the immense pain of grief which Mark felt upon losing his brother.

Mark loved his brother very much and was devastated by Clyde's death as well as upset with himself about his inability to protect his sibling, for Mark felt it was his responsibility to look after Clyde. He, however, did not let his love for Clyde biased his judgment and make excuses for his late brother's behavior; Mark was sane enough to fully acknowledge it was indeed flawed.

Powers

 * Atmokinesis: After he was caught in the particle accelerator's explosion's shock-wave, Mark gained the power to create and manipulate the weather. However, unlike Clyde, Mark's new-found powers are far more precise and potent. He is also able to control it indoors and likewise able to affect a much larger radius than his late brother.

Skills

 * Skilled pilot: Mark is capable of flying airplanes.
 * Intimidation/Interrogation/Torture: Mark managed to torture the coroner with no trouble, and intimidated him enough for him to reveal that it was Joe West that killed Clyde.

Weaknesses

 * Wizard's Wand: In "Out of Time", Mark Mardon attacked the police station and The Flash came to help by using the wand sucking in his powers.

Trivia

 * In the DC comics, Mark Mardon is better known as Weather Wizard, a mantle which his brother, despite having powers based off of Weather Wizard, did not take on the show.