Bartholomew is the quinary antagonist of Professor Ratigan's henchmen in The Great Mouse Detective. He was voiced by the late Barrie Ingham, who also voiced Basil.
He is an alcoholic. He was constantly seen drinking from a beer mug and is disappointed that he ran out. During "The World's Greatest Criminal Mind", he gets very excited when Ratigan dumps a bottle of champagne into his water fountain. He immediately starts drinking from it. Then, Ratigan kicks him, and Barholomew falls in and starts swimming around in it. When Professor Ratigan talks about his history with Basil, Bartholomew starts crying. Later, when they are finishing up a verse of the song, he drunkenly says, "To Ratigan, the world's greatest rat!" which makes Ratigan very angry. He throws him outside the hideout and summons Felicia with a bell. He's too drunk to notice her, and she easily catches and eats his body. After a short period of mourning from the other henchmen, Ratigan suggests they finish the song before has Felicia eat the rest of them, which they do out of fright.