IQ The sibling rivalry between Frasier and Niles reaches a fever pitch when they compare IQ scores. Details Casts Title IQ Genres Comedy Family Release Date 1999-04-08 Episode Runtime 00 Hours 24 Minutes Season Number 6 Episode Number 19 Production Companies Grammnet Productions, Grub Street Productions, Paramount Television, CBS Studios Kelsey Grammer Frasier Crane Jane Leeves Daphne Moon David Hyde Pierce Niles Crane Peri Gilpin Roz Doyle John Mahoney Martin Crane