Garrett was a two-time AFL All-Star. in 1966 and 1967. He played in the first AFL–NFL World Championship Game, now referred to as Super Bowl I, with the Chiefs after the 1966 season. He contributed 17 rushing yards, three receptions for 28 yards, and two kickoff returns for 43 yards in their loss. Garrett won a World Championship ring with the Chiefs in Super Bowl IV, the last AFL–NFL World Championship Game before the AFL–NFL merger, when the AFL's Chiefs beat the NFL's Vikings, 23–7. Garrett was the top rusher of Super Bowl IV with 11 carries for 39 yards and a touchdown, also catching two passes for 25 yards and returning a kickoff for 18 yards. His touchdown came on head coach Hank Stram's iconic 65 Toss Power Trap play call. In his eight professional football seasons, Garrett rushed for 5,481 yards, caught 238 passes for 2,010 yards, returned 14 kickoffs for 323 yards, and returned 39 punts for 235 yards. Overall, Garrett gained a total of 8,049 yards and scored 49 touchdowns (35 rushing, 13 receiving, 1 punt return).