Jan. 14, 1973 – Dolphins became first team to go undefeated in NFL season

They also defeated the Washington Redskins in Super Bowl VII.

The 2007 New England Patriots also went undefeated in the regular season, going 16-0. However, after winning their first two playoff games, they were upset by the New York Giants 17-14 in Super Bowl XLII to finish the season at 18-1.

Highlights from Super Bowl XII: