A compatriot of Injun Joe and Muff Potter. After he argues with the two of them and knocks out Muff Potter, Injun Joe stabs and kills Dr. Robinson and then frames the knocked-out Muff Potter for the murder. Tom and Huck witness these events, and the fact that they know Muff Potter is innocent sets in motion their conflict with Injun Joe.
The timeline below shows where the character Dr. Robinson appears in The Adventures of Tom Sawyer. The colored dots and icons indicate which themes are associated with that appearance.