This copiously illustrated encyclopedia chronicles more than 1,000 DC Comics characters from the 1930s to the present. Arranged alphabetically, each entry gives the first appearance, status (hero, villain, etc.), real name, occupation, height, weight, and eye and hair color of the superheroes or supervillains. Special abilities and superpowers are also listed along with ample cross-references to other comic characters or superleague affiliations, such as the L.E.G.I.O.N. cosmic peacekeeping force.

The biographical entries make fascinating reading in alternative history. For example, the Crimson Avenger served in a league called the Seven Soldiers of Victory during World War II. Afterward, he was sent backward in time. He came forward in time and discovered that he was struck with a terminal disease. After his death, an unknown woman purchased two guns that had belonged to him. These guns transformed her into Crimson Avenger II, who became an agent of vengeance and execution. Of course, famous characters such as Wonder Woman or Batman are included. But lesser-known characters, such as Superman's college flame, Lori Lemaris (a mermaid), are also listed.