- (1950) Stage: Appeared (as "Wendy") in "Peter Pan" on Broadway. Musical (revival). Also in cast: Jean Arthur (as "Peter Pan") and Boris Karloff (as "Mr. Darling" / "Captain Hook"). Songs by Leonard Bernstein, NOTE: Ms. Henderson won the Theatre World Award for her performance.
- (1961) Unsold pilot: Co-starred in a sitcom pilot "I Married a Dog" where her husband's life was constantly upset by her pooch.
- (1951) Stage: Appeared in "The Youngest," at the Cape Playhouse in Dennis, MA. Also in cast: Roddy McDowall.
- (1951) Stage: Appeared in "The Moon is Blue", National Theatre, Washington, DC.