"Robert Montgomery hitch-hikes his way into trouble as Allan Squier, down-and-out-dreamer in Robert E. Sherwood's powerhouse of drama, "The Petrified Forest," seen on "Robert Montgomery Presents -- Your Lucky Strike Theatre, Monday, October 23 ... "
The NBC news release is dated 10/17/50, six days before the show was aired. However, according to the Classic TV Archive (CTVA) listing of Anthology Series (which lists all RM Presents shows with casts and crews) Bob is not listed in the cast. Brian Aherne has filled in for Mr. Montgomery. I'm assuming Bob was ill. Three cheers for Aherne being able to fill in on live television with such short notice. Oh, and IMDB does not list Aherne as being on the show. Ah, sweet mystery of life ...