GM Firebird Concepts
Even though the first Firebird was introduced in 1967, the name was already used by General Motors on four trendy concept cars presented in the late ’50s. Called the GM Firebird I to IV, these were purely show cars with rocket-inspired styling, big fins, and advanced equipment (via Hemmings).
The first Firebird had a jet engine and was essentially an airplane on wheels. Later, the cars were a bit more conventional but still wild. All Firebird concepts were marketed as the cars of the future with numerous insane features such as a TV on the dashboard, outboard drum brakes, and so on. Some car historians claim that those concepts were fantasy cars never intended for production and only served as attention-getters for their car show crowds.