His best year in the NFL was 1969 when he caught 34 passes for 553 yards and five touches. The Vikings won the 1969 NFL Championship Game and advanced to play the Kansas City Chiefs in Super Bowl IV; Henderson was the game's leading receiver with seven catches for 111 yards.
In 1969, Henderson reached his peak performance in the NFL, catching 34 passes for 553 yards and five total interactions. The Vikings secured the championship title in the 1969 NFL Championship Game and proceeded to face the Kansas City Chiefs in Super Bowl IV; Henderson led all players with seven receptions for 111 yards.