[1] In 1941, Sparling, along with writer William Laas, created the United Feature Syndicate comic strip Hap Hopper, Washington Correspondent, for which real-life newspaper columnists Drew Pearson and Robert S. Allen were listed as editors.
[5] Sparling also worked for Classics Illustrated, drawing adaptations of Robin Hood and Mark Twain's Connecticut Yankee in King Arthur's Court.
[11][12] Sparling worked with writer Dennis O'Neil on The Witching Hour[13] and the Challengers of the Unknown.
[14] For Western Publishing's Gold Key Comics, he co-created the superhero Tiger Girl with Jerry Siegel in 1968,[15] drew the toyline tie-in Microbots one-shot,[16] and illustrated comic book adaptations of the television series Family Affair, The Outer Limits, and Adam-12.
[18] For Charlton Comics' satire magazine Sick, he wrote and drew the nudie-cutie feature "Cher D'Flower!