Due to a CBS technicians strike, the "Volcano Seat" episode did not air on April 10. Instead, CBS reran an old episode from 1956 "Phone Call for Matthew Quade". "Volcano Seat" was rescheduled for June 12, 1958, but with several casting changes. Michael Rennie replaced Michael Wilding as Lt. MacKenzie Barton. Patricia Cutts replaced Margaret Phillips as Sharon Barton. Bernie Hamilton replaced James Edwards as James Sullivan.