Adventure Comics #210
Adventure Comics #210 (March 1955) is the birth certificate of Krypto the Super-Dog, one of the most enduring expansions of the Superman mythos in the entire Silver Age. By establishing that Jor-El used a living Kryptonian dog as a test subject for his experimental rockets — and that this same dog survived to reach a teenage Clark Kent on Earth — writer Otto Binder planted the seed of the 'Superman Family,' a concept that would define DC's output for the next two decades. What began as a single 10-page story became the template for every super-powered animal and expanded-Krypton concept that followed, from the Legion of Super-Pets to Beppo and Streaky. Krypto has survived every DC continuity reboot and remains the character's most visible non-human companion, appearing across animation, live-action television, video games, and — as of 2025 — a major Hollywood film.
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The lead story, 'The Super-Dog from Krypton!,' was scripted by Otto Binder — already the most prolific architect of the Superman supporting cast of his era, also responsible for Supergirl and the Legion of Super-Heroes — and penciled by Curt Swan with inks by Sy Barry. The issue was produced under a multi-editor arrangement typical of DC's mid-1950s assembly line: Whitney Ellsworth held credited editorial authority, with Mort Weisinger and George Kashdan serving as story editors. Analysts have noted that the concept of a dog launched into space on a rocket dovetailed neatly with contemporary Soviet suborbital space-dog experiments, several of which occurred in the months immediately before the issue hit newsstands on January 25, 1955, though whether Binder was directly inspired by those classified-at-the-time flights remains unconfirmed. The backup slots in the issue were filled by an Aquaman story drawn by Ramona Fradon and a Green Arrow story penciled and inked by George Papp, both regular contributors to the title at that time.
Trivia · 7 facts
- First appearance of Krypto (the Super-Dog), a Kryptonian dog sent into space by Jor-El in an experimental rocket that was knocked off course by a meteor and landed on Earth during Superboy's teenage years.
- Lead story title: 'The Super-Dog from Krypton!' (10 pages); written by Otto Binder, penciled by Curt Swan, inked by Sy Barry.
- Editors: Whitney Ellsworth (credited editor), Mort Weisinger and George Kashdan (story editors), Jack Schiff (managing editor). Cover pencils by Curt Swan, inked by Stan Kaye.
- Krypto was conceived as a one-off character; reader response was strong enough that he returned in Adventure Comics #214 and by 1959 had become a permanent fixture in the Superboy household, eventually leading the Legion of Super-Pets and the Space Canine Patrol Agency.
- Backup story 1: 'The First Undersea Newspaper' (Aquaman), art by Ramona Fradon. Backup story 2: 'The Defeat of Green Arrow' (Green Arrow and Speedy vs. villain Mr. Genius), art by George Papp. Both backups feature their heroes in Earth-Two continuity.
- Jor-El and Lara appear in flashback in the lead story, providing origin context for Krypto's rocket launch; Lana Lang appears as a supporting character threatening Superboy's secret identity.
- A facsimile edition was published June 18, 2025 (cover-dated August 2025) tied to James Gunn's Superman film; the initial printing contained a documented misprint (a page from the Green Arrow story substituted into the Aquaman story) and was replaced by DC with corrected copies distributed free to retailers.
Cast · 11 characters
Full credits
Full plot ⚠ may contain spoilers
▸ Reveal full plot — may contain spoilers
A super-powerful dog arrives in Smallville in a rocket complete with written records proving that he is baby Kal-El's puppy who Jor-El used as a test animal when developing his space rockets. Though happy to be reunited with his dog, Superboy needs to make sure that Krypto does not give away his secret identity several times before Krypto leaves for a romp in space.
Plot details indexed by the Grand Comics Database (CC BY-SA).