Lyle was a cousin of Indiana Jones.
During his youth, Indiana Jones joined Lyle on a search for the missing professor Dante but learned that Dante may have been the founder of an underground cult.
Behind the scenes
Lyle was to be a character in Young Indiana Jones and the Mask of the Madman, a book which would have been the sixteenth in Random House's Young Indiana Jones young adult novel series. The book ultimately went unreleased but some story information, including Lyle, was archived on online shopping store product pages.
- Young Indiana Jones and the Mask of the Madman (Cancelled)