Callahan took over as coach of the Raiders after Gruden departed to lead the Bucs. As fate would have it, they both faced off that season in Super Bowl XXXVII, with Gruden beating his former assistant. The team underperformed the next season, though, and he was fired by Davis. From there, it was off to coach the Nebraska Cornhuskers. However, the Callahan Era in the land of the corn was a dismal failure: Four seasons, two losing records, a 27-22 overall record capped by a 5-7 mark in his final year that was Nebraska's worst season in 45 years.