1. Cena is credited by WWE as the face of that organization,
2. Cena started his pro wrestling career in 1999 with Ultimate Pro Wrestling, and won its heavyweight title the following year. Cena signed a developmental contract with the World Wrestling Federation (WWF, later renamed to WWE) in 2001, debuting on the main roster in 2002.
3. As of December 2015, Cena has won 24 championships, with 15 reigns as a world champion; a record 12 reigns as WWE (World Heavyweight) Champion ), five reigns as WWE United States Champion, and four reigns as world tag team champion (two World Tag Team and two WWE Tag Team).
4. He also is a 2012 Money in the Bank ladder match winner, a two-time Royal Rumble winner (2008, 2013), and a three-time Superstar of the Year Slammy Award winner (2009, 2010, 2012).
5. He has the fourth-highest number of combined days as WWE World Heavyweight Champion, behind Bruno Sammartino, Bob Backlund, and Hulk Hogan.
6. He has also headlined WWE’s flagship event, WrestleMania, on five occasions (WrestleManias 22, 23, XXVII, XXVIII, and 29) over the course of his career.
7. Outside of wrestling, Cena has released the rap album You Can’t See Me, which debuted at No.15 on the US Billboard 200 chart, and starred in the feature films The Marine (2006), 12 Rounds (2009), Legendary (2010), The Reunion (2011), and Trainwreck (2015). Cena has also made appearances on television shows including Manhunt, Deal or No Deal, MADtv, Saturday Night Live, Punk’d, Psych, and Parks and Recreation.
8. He was also a contestant on Fast Cars and Superstars: The Gillette Young Guns Celebrity Race, where he made it to the final round before being eliminated, placing third in the overall competition.
9. Cena is involved in numerous philanthropic causes; most notably with the Make-A-Wish Foundation.
10. Cena started training to become a professional wrestler in 1999 at Ultimate Pro Wrestling’s California-based “Ultimate University” operated by Rick Bassman.
11. Once he was placed into an in-ring role, Cena began using a semi-robotic character known as “The Prototype”.
12. On October 10, 2000, while billed as The Prototype, Cena made his World Wrestling Federation debut on a WWF SmackDown taping in a dark match against Mikey Richardson, where he was defeated. He received another tryout on January 9, 2001 at a WWF SmackDown taping in Oakland, California, this time defeating Aaron Aguilera.
13. Cena wrestled again in a dark match at WWF SmackDown tapings on March 13.
14. Through 2001, Cena would receive 4 more tryouts with the WWF as he wrestled multiple enhancement talent wrestlers in both WWF house shows and dark matches.
15. Through the early months of 2002, Cena constantly found himself on the losing side of the matches he wrestled in.
16. Yet again wrestling in house shows and dark matches, losing to the likes of Shelton Benjamin and Tommy Dreamer, he had his televised debut against Kurt Angle on August 26 of that same year.
17. In 2001, Cena signed a developmental contract with the World Wrestling Federation (WWF, now WWE).
18. He was assigned to its developmental territory Ohio Valley Wrestling (OVW). During his time there, Cena wrestled under the ring name “The Prototype”.
19. He held the OVW Heavyweight Championship for three months and the OVW Southern Tag Team Championship (with Rico Constantino) for two months.
20. Cena made his WWE television debut on the June 27, 2002 episode of SmackDown! by answering an open challenge by Kurt Angle.
21. After declaring that he possessed “ruthless aggression”, Cena gave Angle a hard fight and only lost by a pinning combination.
22. After the match, Cena was congratulated by The Undertaker, Rikishi, Faarooq and Billy Kidman.
23. Following the near-win, Cena became a fan favorite and started feuding with Chris Jericho, defeating Jericho at Vengeance.