<Li> Val Bettin as Major Dr. David Q. Dawson, previously of the Queen's 66th Regiment in Afghanistan . His character is based upon Dr. John H. Watson from the Sherlock Holmes stories . The interaction between him and Basil mimics that of Watson and Holmes, as Dawson is constantly amazed by Basil's quick - witted deductions . He eventually becomes Basil's associate, friend, and personal biographer . Dawson also serves as the film's narrator . </Li> <Li> Susanne Pollatschek as Olivia Flaversham, An eight - year - old female mouse of Scottish descent who seeks Basil's help in finding her toymaker father . </Li> <Li> Candy Candido as Fidget, Ratigan's bumbling bat right - hand henchman . He tends to do the dirty work for his boss . He has a crippled wing and a peg leg, and, as a result, he cannot fly . Ratigan throws him off the side of his flying machine near the end of the film, and he falls into the Thames . He survives the fall in the book (how is not explained). Candido also voices a reprobate in the pub . </Li> <Li> Frank Welker as Toby, Basil's loyal basset hound . He technically belongs to Sherlock Holmes, who lives above Basil . </Li>

What is the bat's name in the great mouse detective