Egon's unconventional approach to science and his dedication to the paranormal inspire future generations of scientists and paranormal investigators. His equipment and research methods become foundational tools in the field of parapsychology.

It is revealed that Egon spent his later years in Summerville, Oklahoma, studying paranormal activity related to Ivo Shandor and Gozer. He lived in isolation, preparing for Gozer's return, and left behind a hidden laboratory and a series of clues for his family to discover. This demonstrates his unwavering dedication to protecting the world from paranormal threats, even at personal cost.

Egon, as a Force Ghost, assists his family and the remaining Ghostbusters in defeating Gozer, ultimately sacrificing himself to ensure Gozer's permanent banishment. His legacy as a brilliant scientist and selfless hero is cemented. This brings closure to his character arc and solidifies his importance in the Ghostbusters universe.