Season Four of Miami Vice marks the first of several appearances by singer Sheena Easton in the role of recording star Caitlin Davies, with whom Dade County undercover vice cop Sonny Crockett (Don Johnson) falls in love in the episode "Like a Hurricane"--and to whom he is abruptly wed in the very next episode "Rising Sun of Death." This star-crossed romance inaugurates a story thread that will eventually build to the 2-part season finale, in which an amnesiac Sonny part of an ongoing story thread that will build up to the 2-part season finale, in which an an amnesiac Sonny believes himself to be his undercover alter-ego, a drug kingpin named Sonny Burnett, and accordingly ties up with a Colombian crime boss! No, the scripters did not forget costar Philip Michael Thomas as Crockett's partner Ricardo Tubbs, even though it would be Don Johnson who commanded much of the audience's attention this season. As usual, one of the key selling points of Miami Vice (besides its hip dialogue, MTV-style editing and wall-to-wall background music) is the series' intelligent and offbeat utilization of guest stars. Examples include comedian Ben Stiller and character actor Brian Dennehy in "Amen. . .Send Money"; Miguel Ferrer, Penelope Ann Miller and a pre-CSI Paul Guilfoyle in "Death and the Lady"; the versatile Alfred Molina in "The Big Thaw"; up-and-coming Ving Rhames and soul-music icon Isaac Hayes in "Child's Play"; hard-working James Brown and brash youngster Chris Rock in "Missing Hours"; and the multitalented Harry Shearer in (and we're not making this up) "The Cows of October."