Basil of Baker Street, or Basil for short, is the dauntless hero and the main protagonist in Disney's 1986 film The Great Mouse Detective.
Basil is a take off of the classic Sherlock Holmes character, modeling his career after the famous detective's. Moody, dramatic, and a model of English snobbery, but brilliant, he lives in a flat below Holmes's residence, and is a genius of mystery. Mice come from all over England for his assistance.
In the film, when Dr. Dawson meets a lost and frightened Olivia Flaversham, desparately searching for Basil to help her locate her kidnapped father, he helps her find Baker Street. Before long, all 3 are involved in a maze of mystery and intrigue, looking for clues and realizing that all clues point to one person--Basil's arch enemy, the nefarious Professor Ratigan. Quick on his feet and in his mind, Basil and Dawson are able to track down Ratigan's hideout when Olivia is kidnapped as well.
Basil's keen and penetrating mind save the day when, after a near coup of the English royaly and a fierce, animalistic battle on Big Ben, he reunites Olivia with her father, and saves England, with only a few scratches and a smile on his face. At the end, he and Dawson become partners.
Role in the series
Basil reprises his role from the series, and is an ally to Spongebob and friends in the war to defeat Ratigan and Fagin, who Basal has a newfound hatred for cause of him reserecting Ratigan, cause of this, Basal is able to appear as a last minute reinforcement when Ratigan is on the verge of being defeated, supported when he appeared in Spongebob and Friends and cats don't dance, after Darla got defeated. how can it happen, is mainly because that he's a good dectecive, and able to pin-point Ratigan's location, altough how he got to the world, could either be the shell louge van or Ignightus.