The Buick Wildcat is a full-size car that was produced by Buick from the 1963 to 1970 model years. Taking its name from a series of 1950s Buick concept cars, the Wildcat replaced the Invicta within the "junior" B-body Buick sedan range. Serving as the higher-performance full-size Buick, the Wildcat was slotted between the LeSabre and the larger C-body Electra.
Following two generations of the model line, the Wildcat was replaced by the Buick Centurion for 1971, as Buick full-size lines shifted away from high performance and entirely towards medium-price luxury.
(description text adapted from https://en.wikipedia.org/wiki/Buick_Wildcat)