After DePatie–Freleng was sold to Marvel Comics Group in 1981, Gunther became one of the founders of Marvel Productions Ltd., where he served as executive vice president and executive producer on television series such as Spider-Man, G.I.
He then served as executive producer of the animated series The Angry Beavers for Nickelodeon from 1997 to 2001 and Wild West C.O.W.-Boys of Moo Mesa for Greengrass Productions on ABC in 1992.
Other productions by Gunther-Wahl included the animated adaptation of Karate Kid for Coca-Cola Telecommunications (now Sony Pictures Television) on NBC in 1989, and also the short-lived G.I.
Joe animated series from 1990 to 1992 (the preceding Operation Dragonfire five-part mini-series was produced by DIC Entertainment), as well as G.I.
Long-time friend and colleague George Conte, who worked for Murakami-Wolf-Swenson and Fred Wolf Films, and who first met Gunther at DePatie–Freleng, said, "Lee's dedication to quality filmmaking, both technically and creatively placed him at the top of his profession.