David Hyde Pierce

David Hyde Pierce is a guest star on The Simpsons who played Sideshow Bob's brother Cecil. He first appeared in Season 8's Brother from Another Series and ten years later in Funeral for a Fiend. He is best known for playing Fraiser Crane's brother Niles in Fraiser. Sideshow Bob is voiced by Kelsey Grammer who plays Fraiser Crane in Fraiser who is the brother of Niles. John Mahoney who played Martin Crane who is the father of both Fraiser and Niles would later play the the father of Bob and Cecil.

Guest stars in season 8
Michael Buffer • Sally Stevens • Paul Winfield • Rodney Dangerfield • Johnny Cash • Gillian Anderson • David Duchovny • Leonard Nimoy • Jack Lemmon • Alex Rocco • John Waters • Kelsey Grammer • David Hyde Pierce • Joe Mantegna • Dave Thomas • Frank Welker • Bret Hart • Gedde Watanabe • Sab Shimono • Phil Hartman • Gailard Sartain • Tim Conway • Willem Dafoe

Guest stars in season 19

Stephen Colbert • Lionel Richie • Plácido Domingo • Maya Rudolph • Matt Dillon • Steve Buscemi • Ted Nugent • Julia Louis-Dreyfus • Jack Black • Alan Moore • Art Spiegelman • Daniel Clowes • Kelsey Grammer • David Hyde Pierce • John Mahoney • Keith Olbermann • Jon Stewart • Dan Rather • "Weird Al" Yankovic • Kurt Loder • Topher Grace • Terry Gross • Beverly D'Angelo • The Chicks (Natalie Maines • Martie Maguire • Emily Strayer) • Zooey Deschanel • Jim Jarmusch • John C. Reilly • Glenn Close • Lance Armstrong • Drew Carey