His best season came in 1975, when he became a starter and rushed for 509 yards, caught 27 passes for 351 yards, and gained another 391 yards on kickoff returns. He then went on to assist the Cowboys to a Super Bowl X appearance by catching 12 passes for over 200 yards and three touchdowns in their two playoff games, including a 7 reception for 123 yards and three receiving touchdowns (tied a league record) performance against the heavily favored Los Angeles Rams in the NFC title game. His team ended up losing the Super Bowl to the Pittsburgh Steelers, with Pearson rushing for 14 yards and catching 5 passes for 53 yards.