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Some Canadian Football League superstars had brief, nonproductive NFL careers -- remember Dieter Brock or Henry "Gizmo" Williams? Other players leave behind NFL stardom for une tasse de café in Canada (think Ricky Williams). The players on this list excelled in both the NFL and its older, wackier brother to the north.

10. Harald Hasselbach: Hasselbach is one of a handful of players to have won both a Super Bowl and a Grey Cup. The Dutch-born defensive end spent four years with the Calgary Stampeders before joining the Denver Broncos in 1994 and staying in Denver for seven seasons.

9. Ed George: The Steelers' fourth-round pick in 1970, George went north to play tackle for the Montreal Alouettes and Hamilton Tiger-Cats instead of blocking for Terry Bradshaw and Franco Harris. He later returned to the United States to play for the Baltimore Colts and Philadelphia Eagles. George missed his chance to win four Super Bowls, but don't feel too bad for him: He won two Grey Cups with the Alouettes, and he was inducted into the Canadian Football Hall of Fame.

8. Mervyn Fernandez: Christened "Swervin' Mervyn" by his high school quarterback, Fernandez was drafted by the Los Angeles Raiders in 1983 but couldn't make the squad. After heading north to play for the B.C. Lions, he won a Grey Cup and a Most Outstanding Player award. He returned to the Raiders and enjoyed several seasons as a deep threat receiver, catching 57 passes for 1,069 yards and 9 touchdowns in 1989.

7. Jeff Garcia: Despite glowing endorsements from Bill Walsh, Garcia was not drafted when he left San Jose State in 1994. He headed to Calgary to back up Stampeders legend Doug Flutie. Five years and one Grey Cup victory later, Garcia signed with the 49ers as the backup to Steve Young. He's done well for a guy who is supposedly too small and too weak-armed for the NFL.

6. Rocket Ismail: By 1991, the CFL couldn't compete with the NFL when offering salaries to top prospects. But Bruce McNall, owner of the Toronto Argonauts, decided to break the bank for Ismail, locking the Notre Dame superstar into a four-year, $18.2-million contract before the NFL draft. Ismail's nifty running style was perfectly suited for Canada's spacious fields, and he helped the Argos to a Grey Cup championship in his rookie year. Two years later, Rocket joined the Raiders and enjoyed a respectable career as a receiver and return man.

5. Joe Kapp: The former Cal star is one of the few players ever traded from the CFL to the NFL, in a complicated waiver deal explained in the historical pages of the CFL's Web site. Kapp led the B.C Lions to a Grey Cup in 1964, but the Lions traded him to the Minnesota Vikings when the team stumbled in 1967. Kapp led the Vikings to a loss in Super Bowl IV and was briefly the NFL's highest paid player. He's the only CFL Hall of Famer ever to quarterback a Super Bowl team.

4. Joe Theismann: Notre Dame's Theismann was the Heisman Trophy runner-up in 1970, but the Dolphins only offered him a $17,000 contract as a fourth-round pick. The Toronto Argonauts offered him a three-year, $150,000 contract with a $50,000 signing bonus. Theismann made two CFL all-star teams before the Redskins acquired his rights, then spent several years as a punt returner and a backup before winning a starting job and leading the team to two Super Bowls.

3. Doug Flutie: He won six CFL Most Outstanding Player awards and three Grey Cups for the Calgary Stampeders. He was voted the greatest player in CFL history by The Sports Network. He was a pretty darn good NFL quarterback, and he was even a star in the USFL. The 5-foot-9 Flutie was considered too small for the NFL, but Donald Trump gave the Heisman winner a $3.1 million contract to helm the USFL's New Jersey Generals. When that league folded, Flutie endured a brief stint with the Chicago Bears before becoming a superstar north of the border. He came back to the states and had several fine seasons for the Buffalo Bills and San Diego Chargers before finishing as a backup with the New England Patriots.

2. Cookie Gilchrist: A bruising fullback and linebacker, Gilchrist was so good that the Cleveland Browns tried to sign him straight out of high school. When that deal fell through, Gilchrist went north, playing rugby before signing with the Hamilton Tiger-Cats in 1956. He won a Grey Cup and played for several teams before joining the Buffalo Bills of the brand-new American Football League. He became that league's first 1,000 yard rusher and reached the AFL All-Star game four times. His final all-star appearance was his most famous: Gilchrist led an anti-segregation protest that got the game moved from New Orleans to Houston.

1. Warren Moon:He's the only player enshrined in both the Canadian Football Hall of Fame and the Pro Football Hall of Fame. He led the Edmonton Eskimos to five straight Grey Cup victories. He reached the Pro Bowl nine times. He threw for over 70,000 yards in his pro career. Not bad for a player NFL scouts wanted to move to tight end. African-American quarterbacks were rare in pro football when Moon left the University of Washington in 1978, and the NFL ignored the Rose Bowl MVP in the draft when he refused to change positions. Thirty years later, Moon is an all-time great in two countries.

Mike Tanier is Contributing Editor at FootballOutsiders.com and a co-author of Pro Football Prospectus 2008, available in bookstores now.