To explain the different choices:

Season 0-1: Host: Joel; Bots: Servo voiced by Josh Weinstein, Crow voiced by Trace Beaulieu; Mads: Dr. Clayton Forrester & Dr. Laurence Erhardt

Season 2-5.5: Host: Joel; Bots: Servo voiced by Kevin Murphy, Crow voiced by Trace Beaulieu; Mads: Dr. Clayton Forrester & TV's Frank

Season 5.5-6: Host: Mike; Bots: Servo voiced by Kevin Murphy, Crow voiced by Trace Beaulieu; Mads: Dr. Clayton Forrester & TV's Frank

Season 7: Host: Mike; Bots: Servo voiced by Kevin Murphy, Crow voiced by Trace Beaulieu; Mads: Dr. Clayton Forrester & Pearl Forrester

Season 8-10: Host: Mike; Bots: Servo voiced by Kevin Murphy, Crow voiced by Bill Corbett; Mads: Pearl Forrester, Professor Bobo & Observer

Season 11: Host: Jonah; Bots: Servon voiced by Baron Vaughn, Crow voiced by Hampton Yount; Mads: Kinga Forrester & Max

The Original Cast, thats how the MST3K go started with