T.R. Chula was the secondary antagonist of American Tail: Fievel Goes West, his name is a play on his species - namely a tarantula spider and he had the appearance and mannerism of an Old West outlaw.
T.R. Chula was also sadistic and cruel, though still rather hopelessly inept at his job, he acted as the right-hand man to Cat R Waul and enjoyed causing mischief - he was also fond of terrorising mice, which he also apparently found suitable food as he threatened to devour Fievel on several occassions.
T.R. Chula would meet the same fate as the rest of Cat R. Waul's thugs however in the end as was fired off into the distance when their giant mousetrap was used against them, acting like a catapult and sending the outlaws soaring out into the desert - though he returns as one of the reccuring villains in the short lived television series based on the movie.