sorry...I'm somewhat new to site and reviewing some rather old posts....but am loving the detail of those said posts
as for worst actor/actress...the difference between Ray Milland's two appearances is night and day...fantastic in Death Lends a Hand and lame lame lame in Greenhouse.
My fellow Canadian Larry Mann's performance...Albert... in Murder Under Glass was very wooden I thought.
other mentions
Shirley Blaine..Lovely but Lethal
Ruth Stafford (Collin Wilcox)...Exercise in Fatality
Lewis Lacey ..(Darrell Zwerling)...Exercise in Fatality
the boy genius...Mayhem
Janie Brandt ...Jeannie Berlin ...Old Fashioned Murder