The Toyota Celica XX - The Father of Supra.

Launched as the premium package of the long-popular Toyota Celica, the "XX" pronounced "double-x" featured a pair of inline 6 engines as choices over the standard Celica's inline 4. 4M-EU 2600cc or (1)M-EU were the inline-6 options. And late-models were equipped with a 2800cc 5M-EU as well as adopting the first independent rear suspension for the lineup.

In the USA, the 1978 was the launch year with the only choice being the 5M-EU, and this was the first "Supra" as the name "XX" was met with opposition by the sales division for very obvious reasons.
However this "Supra" name was not adopted in Japan until two generations later in 1988, when the Supra line split from the Celica line. This is when the Celica moved on to package with the "T" chassis front-drive/all wheel drive layouts, while the Supra retained the sporting/luxury rear-drive "A" chassis layout.