[5] WrestleMania is considered World Wrestling Entertainment's (WWE) flagship pay-per-view (PPV) event, having first been held in 1985.

It has become the longest-running professional wrestling event in history and is held annually between mid-March to mid-April.

[6] It was the first of WWE's original four pay-per-views, which includes Royal Rumble, SummerSlam, and Survivor Series, referred to as the "Big Four".

[7] WrestleMania 21 was scheduled to be held on April 3, 2005, at Staples Center in Los Angeles, California.

It was the first WrestleMania held at Staples Center, but the fifth to take place in the Los Angeles metropolitan area (after 2, VII, XII, and 2000).

[9] The parody movie trailers included: Celebrity guests in attendance for WrestleMania 21 included David Arquette, Motörhead, Adam Sandler, Rob Schneider, Billy Gibbons from ZZ Top, The Black Eyed Peas, Billy Corgan from The Smashing Pumpkins, Anthony Kiedis from Red Hot Chili Peppers, Ice Cube, Carmen Electra, Sylvester Stallone, Marg Helgenberger, Matt Groening, Rick Rubin, Will Sasso, and Macaulay Culkin.

[10] On the February 7 episode of Raw, Triple H defeated Edge to retain the World Heavyweight Championship due to Batista's interference.

During the latter event, John "Bradshaw" Layfield (JBL) successfully defended the WWE Championship against the Big Show in a Barbed Wire Steel Cage Match.

[15] JBL then destroyed Cena's customized United States Championship belt and replaced it with the original one.

General Manager, Theodore Long make his way to the ring and inform Cena that he had to wait until WrestleMania to get his hands on JBL.

[17] In a Six-Man Tag Team match that night, Cena and the WWE Tag Team Champions, Eddie Guerrero and Rey Mysterio defeated JBL and the Basham Brothers, but Cena had to stop himself from attacking JBL after the bell had rung.

[18] Cena then attempted to provoke JBL, by vandalizing his limousine, cutting off his tie, pouring water into his hat and spray painting "FU" on his shirt.

[10][20] The next month at No Way Out, Angle lost a number one contenders match to John Cena, losing a spot in the SmackDown!

Orton fled the ring after the Undertaker began to fill the arena with smoke, and didn't sign the contract.

Shortly thereafter, Orton turned heel and furthered his Legend Killer gimmick by performing an RKO on Stacy Keibler, who was his girlfriend at the time.

A 30-man interpromotional Battle Royal, which featured: Booker T, Paul London, Heidenreich, Spike Dudley, Nunzio, Funaki, Doug Basham, Danny Basham, Orlando Jordan, Mark Jindrak, Luther Reigns, Scotty 2 Hotty, Hardcore Holly, Charlie Haas, Billy Kidman, and Akio from SmackDown and Simon Dean, William Regal, Tajiri, Rob Conway, Sylvain Grenier, Snitsky, The Hurricane, Rosey, Chris Masters, Viscera, Rhyno, Val Venis, Tyson Tomko, and Maven from Raw.

The match contained many notable moments, including points where Jericho, Christian, Benjamin, and Kane all jumped over the top rope to the outside of the ring to knock down multiple opponents.

[1][42] The next match was for the WWE Women's Championship, an encounter between Trish Stratus and Christy Hemme with Lita at ringside.

Following the low blow, which was not seen by the referee, Michaels leapfrogged from the ring and laid out Angle on a broadcast table.

Both ended the segment celebrating with beer until Austin gave Piper a Stone Cold Stunner.

Cena won the match after ducking a Clothesline from Hell attempt and executing an FU to win the title.

While the referee was down, Triple H attacked Batista with a low blow and the title belt for a near fall.

John Powell of Canadian Online Explorer's professional wrestling section noted that "The changing of the guard that many people expected came with a whimper instead of a bang.

In a total reversal from last year's show – where a largely mundane card was saved by the emotional title victories of Chris Benoit and Eddie Guerrero – this year's elevation of rising stars John Cena and Dave Batista had no such drama.

Unable to live up to the high standards set by the Undertaker-Randy Orton and Shawn Michaels-Kurt Angle bouts, the "main events" offered the worst kind of anticlimax and would have been right at home buried in the middle of the card."

[44] Robert Leighty Jr of 411mania gave the event an overall score of 7.0 out of 10.0 noted that "If the two Title matches would have delivered this would have gone down as one of the greatest WrestleMania's ever, but they didn't and that left a flat ending to the show.

He stated that "this was on its way to being every bit as good as last year's Mania" but like most of the other critics who thought the main events were disappointing also said that "then it hit a wall in the last 90 minutes."

Although he praised the booking of the event saying that, "they made all the right moves booking-wise, so while the matches weren't great, they still have a certain historic value.

"[54] For the Staples Center's 10th anniversary in 2009, WrestleMania 21 was ranked number 7 on the list of greatest moments in the venue's history as voted by fans.

[57] Following that, the two concluded their storyline at Vengeance where Batista scored the third and final win over his former mentor inside Hell in a Cell.