Educator fascinated by Egon's research.
Their relationship connects Callie's family life with Grooberson's interest in the paranormal.
Callie later dates Grooberson after he teaches Phoebe's summer science class.
Grooberson becomes an adult scientific resource for Phoebe.
Phoebe enrolls in a summer science class taught by Grooberson, a seismologist.
He supports the children's investigation through scientific knowledge.
Grooberson helps Phoebe and Podcast learn more about the Ghostbusters and examines the ghost trap with them.
Explore the full interactive character relationship map of Ghostbusters: Afterlife