Wonderbug (1976)

"Wonderbug" is a children's live-action television series in which three youths - Barry, Susan and C.C. - outwit assorted villains with the assistance of their junkyard car, "Schlepcar," which can magically transform into the crime-busting Wonderbug. Using a different disguise each week, this "Mod Squad" for kids plus their magic car proved to be invulnerable to the forces of evil.