Helio was a member of the Sentinels.
Rick Strong became the gravity defying Helio, nominal leader of the Sentinels, after he and his comrades Mentalia and The Brute gained technologically induced super powers from Dr. Kolotov. They had a brief career as superheroes, during the course of which Rick was temporarily rendered amnesiac by the villainous Mindbender.
- This version of Rick Strong, including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 6 Appearances of Rick Strong (Earth-Four)
- 1 Images featuring Rick Strong (Earth-Four)
- Quotations by or about Rick Strong (Earth-Four)
- Character Gallery: Rick Strong (Earth-Four)