Beast Mode is back. 

On Wednesday, Marshawn Lynch showed up to the Raiders' facility with a wide smile and a spring in his step, ready to resume an NFL career we thought was over. 

The Seahawks agreed to trade one of the NFL's most physical runners, who sat out the 2016 season before jumping back into the league. 

He'll be a starter, replacing departed Pro Bowler Latavius Murray, but how many touches can a 31-year-old who hasn't been hit in over a year be asked to take? He'll have the luxury of running behind one of the NFL's best offensive lines in one of its best offenses, led by Derek Carr. However, scatbacks Jalen Richard and DeAndre Washington offer younger legs and a likely committee approach to running the ball. 

Will Lynch have the same combination of power and speed that once literally caused an earthquake? He'll have four months to get his body back ready for the rigors of an NFL season. He's also not alone. Plenty of other greats have made returns to their sport after retiring. How did their second acts play out?

Michael Jordan

First retirement: October 1993
First return: March 1995

No retirement and return was bigger or more public. Jordan left the game at the height of his power, a three-time defending champion and a three-time MVP. His father was murdered in July 1993. He was tired from a summer training and competing in the Olympics in '92, rather than recharging his almost 30-year-old body. He was also tired of fame and the spotlight. So he left and tried to play baseball. He barely cleared a .200 batting average in his season playing for the Double-A Birmingham Barons, and on March 18, 1995, in the midst of an MLB strike, he sent out a two-word press release: "I'm back." He played the next day and went on to win three more titles with the Bulls from 1996-98 and two more MVPs. 

Second retirement: January 1999
Second return: September 2001

Jordan ended his Bulls career with a championship-winning shot in the highest-rated game in NBA history. It was a perfect way to ride into the sunset, and management blew up the Bulls after a sixth title in eight seasons. In 2000, Jordan took over as part owner and president of basketball operations with the Wizards. It spawned an itch. On Sept. 25, 2001, he announced his return to the court and his intention to donate his salary to victims of the 9/11 attacks. He battled a knee injury for most of his return, which never really had a memorable moment, but he did become the first 40-year-old to score more than 40 points in a game. 

Brett Favre

Retirement: March 2008
Return: July 2008

Favre's waffling over his future is legendary, but his career with the Packers met a controversial end. Favre decided he wanted to come back, but the Packers were ready to move on behind the promising Aaron Rodgers. They were also unwilling to give him an unconditional release amid rumors he was planning to sign with division rival Minnesota. Favre eventually turned down $25 million to stay retired and the Packers traded him to the Jets. He threw for 22 touchdowns and 22 picks and quietly retired again after the season. However, rumors surfaced again during the summer, and he sat down for a meeting with Minnesota coach Brad Childress in May. In July, Childress announced Favre would stay retired, but a month later, Favre was suiting up for the Vikings. In 2009, he looked a decade younger, despite his graying hair. He threw 33 scores and seven picks to carry Minnesota to the NFC title game. He retired for good after throwing 11 TDs and 19 picks a year later. 

Mario Lemieux

Retirement: April 1997
Return: December 2000

Lemieux battled cancer and injuries late in his career, but he fought through them to return to health before retiring at 32 and moving into the Penguins' front office. He was tasked with guiding a franchise in dire financial straits. It declared bankruptcy and on Sept. 3, 1999, his ownership group took over. Like Jordan, Lemieux was too close to the game to stay away for good. On Dec. 27, he made his return as a player/owner after 44 months away and managed to put up 76 points in just 43 games, finishing second in the Pearson Award voting for the league's most valuable player. Lemieux stayed active for six more years, battling through an irregular heartbeat, a back injury and a players strike that all kept him off the ice for long stretches. He led the Penguins in points in 2002-03 but played just 10 games the next year as Pittsburgh finished last in the NHL for the first time since 1984.  

Bjorn Borg

Retirement: January 1983
Return: November 1990

The all-time great and 11-time Grand Slam champion shocked the world by retiring at age 26. Almost eight years later, with his bank account dwindling and fashion empire crumbling, he made a comeback, foregoing modern technology in favor of a wooden racket, which he felt gave him better control. He eventually switched to graphite but he never won another major match in his regrettable return. Not everyone gets a happy ending when they come back to a sport they once dominated. 

Michael Phelps

Retirement: August 2012
Return: April 2014

Phelps didn't leave himself any wiggle room when he retired after the London Olympics. "I'm done. I'm finished. I'm retired. I'm done. No more," he said. A month after returning, he won the 100-meter butterfly at the Arena Grand Prix and ramped up for Rio. He was named a captain of the team and the flag bearer for the opening ceremonies of the 2016 Olympics. He came home with five gold medals and a silver, officially closing his career with 28 total medals and a status as the most decorated Olympian ever.

George Foreman

Retirement: March 1977
Return: March 1987

Foreman lost to Jimmy Young in Puerto Rico and lost. In the locker room after the fight, he got sick and suffered a near-death experience. It inspired him to commit his life to God and retire from boxing. A decade later, he was back as an ordained minister looking to make money for his youth center. He won eight fights the next year and lost a close title fight on points to Evander Holyfield in 1991. Three years later, he knocked out Michael Moorer to recapture the heavyweight belt that Muhammad Ali took from him 20 years earlier. At an astounding 45 years old, he's still the oldest heavyweight champion ever. 

Magic Johnson

Retirement: November 1991
Return: January 1996

Johnson's retirement is one of the most shocking moments in sports history. The superstar and magnetic personality discovered he'd contracted HIV during a preseason physical and made an emotional retirement announcement on Nov. 7, 1991. 

Fans loved him enough to vote him as a starter for the All-Star Game. Amid paranoia and uncertain times surrounding HIV/AIDS, he played, despite protestations from ex-teammates and, most notably, Karl Malone. He also suited up for the Dream Team that summer and cruised to a gold medal. 

His intention to make a full-time return to the NBA that fall ramped up the controversy, and Johnson shelved his plans. At age 36 in 1996, Johnson revisited a return after a brief run as the Lakers' head coach. 

He averaged 14.6 points in his 32 games, but the Lakers were eliminated in the first round of the playoffs. His time on the court came and went with little incident, and as modern medicine has progressed, we know now how overstated the fear was back then.

"If I knew what I know now, I wouldn't have retired," Johnson said in 2011. 

Roger Clemens

Retirement: October 2006
Return: June 2007

Clemens had a flare for the dramatic. He announced his comeback with a microphone during the seventh-inning stretch of a Yankees game in May. Clemens "retired" after the 2004 and 2005 seasons, but he re-signed with his hometown Astros on both occasions. This time, with little chatter or run-up, he showed back up to Yankee Stadium, the place he won World Series titles in 1999 and 2000. He made 17 starts and posted a 4.18 ERA, the third-worst of his career.

Muhammad Ali

Retirement: July 1979
Return: October 1980

The Greatest wanted one more chance at the WBC Heavyweight title and one more pay day, and the champion, Larry Holmes, reluctantly obliged. Ali's hands were already trembling by then and his voice stuttered. Ali took thyroid medication to lose weight and was dominated. His trainer stopped the fight in the 11th round, but it is widely considered to have contributed to Ali's Parkinson's, which claimed his life in 2016. Ali fought again in December 1981 and lost to Trevor Berbick. 

Deion Sanders

Retirement: July 2001
Return: September 2004

Sanders was one of the most dynamic NFL talents ever, extending his talents to Major League Baseball as well. At 37 years old, after three years away from the game, Sanders joined a stout Ravens defense as a nickel back. He was a shell of his former self but stuck around for two seasons, making 35 tackles in six starts and picking off five passes, returning one for a score. He wasn't Prime Time, but to be pushing 40 and still be a serviceable player in the secondary is a near impossibility.