Jim Harper

The Guardian is the head of security at Cadmus's Washington, D.C. facility.

Personality
The Guardian is a calm level headed figure of authority. Unlike his employer, Dr. Desmond, he tends to be a bit more open minded on certain issues and will seek a peaceful resolution is possible. This annoys Desmond to no end and he often has to use Guardian's G-Gnome to make him see his way.

Physical appearance
The Guardian wears a golden helmet and golden shoulder and wrist pads that partially hide a dark blue jump suit.

Early life
Guardian was already a known figure before joining Cadmus as chief of security.

Present
Guardian investigated a small fire on at ground level, and after notifications from genomorphs, he found three intruders: Robin, Aqualad and Kid Flash. He tried to make them leave peacefully, but when Kid Flash mentioned the weapons made in the facility—something Guardian seemed unaware about—his G-Gnome made him attack them. They fled, and eventually locked themselves in with Project Kr. They released the Superboy, but the clone's programming turned against them. They were quickly defeated.

With the sidekicks in containment pods, Guardian saw no need to return Superboy to his pod immediately. Desmond disagreed, and used the G-Gnome's to sway Guardian. But on his way back, Superboy rebelled and broke the sidekicks out. Guardian and the genomorphs chased them.

At the ground level, Dubbilex revealed that he was behind the events set in motion the previous day, so Superboy could be free. He lifted the telepathic control on Guardian, who vowed to deal with Desmond whilst the other exposed Cadmus. But Desmond would not go without a fight. He ingested Project Blockbuster, and in his new, monstrous form, knocked Guardian out.

After Desmond was defeated, and the Justice League arrived, Guardian told his story to Batman, Aquaman and Flash.

Later, The Cadmus Board of Directors appointed him as the new head at their DC branch. On his first day, Guardian appointed Dr. Spence as acting chief scientist and declared no more G-Gnomes would be used to suppress wills nor would there be any more secret breeding projects, and that he would usher in a new "Kinder, gentler Cadmus".

Abilities and Equipment
Guardian is shown to be proficient in hand-to-hand combat, besting Aqualad in it. He carries a golden heater shield on his wrist.

Background in other media

 * In the comics, Jim Harper is related to Roy Harper (Speedy/Red Arrow), being his great-uncle. In the series, the two characters are voiced by the same actor, Crispin Freeman.