WISEGUY: Mel Profitt Ken Wahl, Kevin Spacey 10 hrs., 4 discs, 1988 (StudioWorks)
This is the legendary 1988 story arc in which Ken Wahl's central undercover agent graciously ceded screen time to allow a star to be born. Kevin Spacey's Mel Profitt was a cuckoo crime boss: paranoid and prone to quoting 18th-century economist Thomas Malthus and playing Russian roulette. He is soothed only by the incestuous caress of his sister, Susan (a willowy Joan Severance), who shoots drugs with a ''little extra surprise'' into bro's feet -- thus Mel's muzzily uttered motto, ''Only the toes knows.'' EXTRAS Good, blunt interviews with the stars and producers Stephen J. Cannell and David Burke -- for example, the latter casually refers to his previous boss Michael Mann as ''tyrannical,'' and Spacey reveals that folks still come up to him and repeat Mel's immortal, wacky mantra.