They played the Kansas City Chiefs in the first Super Bowl.
The Dallas Texans became the Kansas City Chiefs in 1963. The first pro football championship was played a long time before that. But if the question is about the first Super Bowl, the Green Bay Packers beat the Chiefs 35-10.
The Chiefs have not made a championship appearance since they won Super Bowl IV in January 1970.
In Super Bowl I the Packers beat the Kansas City Chiefs, 35-10
The Miami Dolphins Vs. The Kansas City Chiefs. Dolphins win.
Kansas City Chiefs
Fred Arbanas has: Played Himself - Dallas Texans Tight End in "1962 AFL Championship Game" in 1962. Played Himself - Kansas City Chiefs Tight End in "1966 AFL Championship Game" in 1967. Played Himself - Kansas City Chiefs Tight End in "AFL-NFL World Championship Game" in 1967. Played Himself - Kansas City Chiefs Tight End in "1969 AFL Championship Game" in 1970. Played Himself - Kansas City Chiefs Tight End in "Super Bowl IV" in 1970.
The Green Bay Packers and the Kansas City Chiefs
the packers and kansas city chiefs
Ed Budde has: Played Himself - Kansas City Chiefs Guard in "1966 AFL Championship Game" in 1967. Played Himself - Kansas City Chiefs Left Guard in "AFL-NFL World Championship Game" in 1967. Played Himself - Kansas City Chiefs Guard in "1969 AFL Championship Game" in 1970. Played Himself - Kansas City Chiefs Left Guard in "Super Bowl IV" in 1970. Played Himself - AFC Guard in "1971 NFL Pro Bowl" in 1971.
Johnny Robinson has: Played Himself - Dallas Texans Safety in "1962 AFL Championship Game" in 1962. Played Himself - Kansas City Chiefs Right Safety in "AFL-NFL World Championship Game" in 1967. Played Himself - Kansas City Chiefs Free Safety in "1966 AFL Championship Game" in 1967. Played Himself - Kansas City Chiefs Free Safety in "NFL Monday Night Football" in 1970. Played Himself - Kansas City Chiefs Right Safety in "Super Bowl IV" in 1970. Played Himself - Kansas City Chiefs Free Safety in "1969 AFL Championship Game" in 1970.
That was Super Bowl IV against the Kansas City Chiefs on January 11, 1970. The Chiefs won 23-7.