The Plymouth Reliant was introduced and 1981 as one of the first K-cars. Along with its twin the Dodge Aries it sold about 2.1 million units and gave a big boost to Chrysler's finances.
'81 Reliant brochure
It was initially powered by a 2.2L inline-4 making 84 horsepower which propelled it to 60 mph in about 13 seconds.
The car is mentioned in the Barenaked Ladies song "If I Had A Million Dollars" in the verse:
And if I had a million dollars
(If I had a million dollars)
Well, I’d buy you a K-Car
(A nice reliant automobile)