A portly young man named Billy Batson lived in Brooklyn, New York on Earth-S during the 1930s-40s. Having learned of a famous WHIZ Radio commentator who shares his name, Billy met with two other young men (also named Billy Batson) and traveled to WHIZ Radio to meet the younger, more famous Batson. To differentiate between each other, Billy of Brooklyn became known as "Fat Billy" and the other two became known as "Tall Billy" and "Hill Billy". They all formed the Billy Batson Club. Young Billy's nemesis Doctor Sivana hatched a plan to kill the "real" Billy Batson and sent his henchmen to find out where Billy lived. Sivana's goons mistakenly found the other Billy Batsons instead and captured them. Sivana used them as bait to trap the real Billy. Sivana and his henchmen gagged Billy and tied him and the other Billys to a buzzsaw. Billy was able to remove his gag but his shout of "Shazam" could not be heard over the roar of the buzzsaw. With seconds to spare, Billy enlisted the aid of his club members and they all shouted "Shazam" together. When the smoke cleared, Captain Marvel saw that the other Billys had transformed as well, into Tall Marvel, Hill Marvel and Fat Marvel. Hill Marvel remarked that they had each changed into Captain Marvel but Fat Marvel countered that by saying that there is only one Captain Marvel. Tall Marvel suggested that they were really Lieutenant Marvels, hence the trio's name. The Captain and his three Lieutenants easily defeated Sivana and his henchmen. After shouting "Shazam" and transforming back into their civilian identities, the three Billys headed back home. The Lieutenant Marvels regrouped to help Captain Marvel and his pals Mary Marvel and Captain Marvel, Jr. on several occasions. In their final adventure together, the Lieutenants were once again captured by Doctor Sivana during the Crisis on Infinite Earths event. The Crisis resulted in the collapse of the Multiverse, and all of the occupants of Earth-S, including the Lieutenant Marvels ceased to exist.
- This version of William "Fat Marvel" Batson (Earth-S), including all history and corresponding appearances, was initially erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. However the ending of Convergence retroactively prevented that collapse, saving all the alternate realities, though in an "evolved" form. Even though versions of the character may have since appeared, this information does not apply to those versions.
- Appearances of William "Fat Marvel" Batson (Earth-S)
- Images featuring William "Fat Marvel" Batson (Earth-S)
- Quotations by or about William "Fat Marvel" Batson (Earth-S)
- Character Gallery: William "Fat Marvel" Batson (Earth-S)