Tropicana Casino owner Frank Howell (a non-singing Dean Martin) calls Bosley and the Angels to Las Vegas to investigate some suspicious deaths that he believes are part of a plot to gaslight him.
- In the third season opener, a showgirl Mary Phillips becomes the second employee of the Tropicana Hotel and Casino to perish in a deadly auto accident, Tropicana owner Frank Howell hires the Angels to establish a motive for the killings. Kelly joins the hotel's show as a dancer, while Kris is hired as the new backup singer for lounge star Marty Cole. Suspicion for the attacks falls on rival casino owner Mark Haynes, who is in cahoots with Cole to put Frank out of business. Haynes is unaware, however, that Cole has taken their plan one step further.