WrestleMania 23 was the twenty-third annual WrestleMania professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE). It took place on April 1, 2007 at Ford Field in Detroit, Michigan. The event was the first WrestleMania at Ford Field and the second to take place in the Detroit metropolitan area (following WrestleMania III, at the Pontiac Silverdome, in Pontiac, Michigan). It is also, to date, the only time the official WresleMania logo was not used as the main logo for the event.

The event was a joint-brand pay-per-view, featuring performers from the Raw, SmackDown!, and ECW brands. Eight professional wrestling matches were featured on the event's supercard, a scheduling of more than one main event. The main match on the Raw brand was John Cena versus Shawn Michaels for the WWE Championship, in which Cena won. The predominant match on the SmackDown! brand was Batista versus The Undertaker for the World Heavyweight Championship, in which The Undertaker was victorious. The primary match on the ECW brand was an Eight Man Tag Team match between The ECW Originals and The New Breed; The ECW Originals claimed victory in the match. The featured matches on the undercard included Bobby Lashley versus Umaga and an interpromotional Money in the Bank ladder match.

John Felix Anthony Cena (/ˈsiːnə/; born April 23, 1977) is an American professional wrestler and actor. He is currently signed to WWE as a member of its Raw brand.

In WWE, Cena has won 19 championships in total, including 12 world titles (having won the WWE Championship a record 10 times and the World Heavyweight Championship twice). In addition, Cena has also won the WWE United States Championship three times, and is a four-time Tag Team Champion, having held the World Tag Team Championship twice (once each with Shawn Michaels and Batista), and the WWE Tag Team Championship twice (once each with David Otunga and The Miz). Cena also won the 2008 Royal Rumble match, and is a two-time Superstar of the Year Slammy Award winner (2009 and 2010). He also has the fourth highest number of combined days as WWE Champion behind Bob Backlund, Hulk Hogan and Bruno Sammartino.

Cena started his professional wrestling career in 2000, wrestling for Ultimate Pro Wrestling, where he held the UPW Heavyweight Championship. In 2001, Cena signed a contract with the World Wrestling Federation (WWF) and was sent to Ohio Valley Wrestling (OVW) where he held the OVW Heavyweight Championship and the OVW Southern Tag Team Championship (with Rico Constantino).

Mark William Calaway (born March 24, 1965) is an American professional wrestler better known by his ring name The Undertaker. He is signed to WWE and is the company's most tenured competitor. Calaway began his wrestling career with World Class Championship Wrestling (WCCW) in 1984. He joined World Championship Wrestling (WCW) as "Mean" Mark Callous in 1989. When WCW did not renew Calaway's contract in 1990, he signed with the World Wrestling Federation in October and, after shortening his name from Kane the Undertaker to simply The Undertaker, has remained with the company since.

The Undertaker has two contrasting personas. The first is the role of The Deadman, an undead, occult-like figure, which has consisted of many different styles. He debuted his original Deadman persona during his own on-camera debut at Survivor Series (1990). At this event, the Undertaker was clad as a Western mortician. Next, in October of 1998, the Undertaker appeared as the leader of the Ministry of Darkness (with similar apparel). Since WrestleMania XX, the Undertaker has appeared as a hybrid version of the Deadman character, using elements of the previous Deadman incarnations.