William Jason Reso (born November 30, 1973) is a Canadian professional wrestler and actor. He is signed to All Elite Wrestling (AEW), where he performs under the ring name Christian Cage.

Reso made his debut in 1995. He wrestled in Canadian independent promotions early in his career, where he competed in singles and tag team competition with his best friend Edge. In 1998, he signed a developmental contract with the then-World Wrestling Federation (WWF, renamed to WWE in 2002) and made his debut the same year as Christian, immediately capturing his first championship in the company, the WWF Light Heavyweight Championship, in his debut match. Edge and Christian gained notoriety for their participation in Tables, Ladders, and Chairs matches. They won the promotion's World Tag Team Championship on seven occasions. They are considered one of the major teams that revived tag team wrestling during the Attitude Era. The team parted ways in 2001, after which, Christian held various singles titles in WWE, including the European, Hardcore, and Intercontinental Championships.

In 2005, Reso departed WWE and signed with Total Nonstop Action Wrestling (TNA) under his Christian Cage ring name, after which, he won the NWA World Heavyweight Championship twice. He left TNA in late 2008 and re-signed with WWE in 2009, where he won the ECW Championship and the World Heavyweight Championship twice each until retiring in 2014 due to concussion issues. He was the 23rd Triple Crown Champion and 11th Grand Slam Champion in WWE history.

In March 2021, Cage made his debut for AEW, again reverting to his Christian Cage moniker, and officially resuming his in-ring wrestling career. Following this, he won the Impact World Championship on the first episode of AEW Rampage in 2021 (as AEW and Impact had a partnership at the time), and in 2023, he won his first title under the AEW banner in the AEW TNT Championship, which he has held twice. Additionally, he is a former one-time AEW World Trios Champion. He has headlined multiple pay-per-view events between WWE, TNA and AEW, and was one of WWE's most prolific pay-per-view performers. Between the three aforementioned promotions, Cage has held 26 total championships, including seven world titles and nine tag team titles.

William Jason "Jay" Reso was born in Kitchener, Ontario, on November 30, 1973, the son of Canadian mother Carol and American father Randy Reso. He played ice hockey and was a wrestling fan as a child. He lived in Huntsville and East Luther-Grand Valley before moving to Orangeville, where he met Adam "Edge" Copeland, who became his best friend and tag team partner. They attended Orangeville District Secondary School together, from which they both graduated.

In September 1994, Reso enrolled in a wrestling school run by Ron Hutchison at Sully's Gym. One of his early ring names was Christian Cage, a combination of the names of actors Christian Slater and Nicolas Cage. Cage's wrestling career began in June 1995 in a match against Zakk Wyld, which resulted in a draw. In 1997, he was a part of Thug Life, a stable that included Joe E. Legend, Zakk Wyld, Rhino Richards, and Copeland (under the name Sexton Hardcastle). As a tag team on the Canadian independent circuit, Reso and Copeland were known as High Impact and later The Suicide Blondes. The duo held titles in numerous promotions and competed in the United States and Japan. Reso won the East Coast Wrestling Association (ECWA) Heavyweight Championship on July 18, 1998, which he held until October 15, 1999. When Copeland received a tryout match with the World Wrestling Federation (WWF), Reso went with him and they faced off in a non-televised tryout match, which Copeland was booked to win. After the tryout, once Copeland was promoted from his developmental status to touring with the WWF, he put in a good word for Reso and got him invited to Dory Funk Jr.'s WWF-affiliated Funking Conservatory training camp in 1998. After completing his training at the conservatory, Reso signed a contract with the WWF to become a full-time performer.

When Reso came to the WWF, he shortened his ring name to Christian. Christian made his television debut as a heel at WWF's pay-per-view event Breakdown: In Your House on September 27, distracting Edge during his match against Owen Hart to reveal his allegiance to Gangrel. Christian won the WWF Light Heavyweight Championship in his debut match against Taka Michinoku at Judgment Day: In Your House on October 18. He lost the title to Gillberg a month later.

Christian was given the character of a vampire and formed an alliance with Gangrel and Edge, who (in storyline) was finally persuaded to join what became known as The Brood. At Rock Bottom: In Your House on December 13, The Brood defeated The J.O.B. Squad in a six-man tag team match, then they briefly feuded with The Undertaker's Ministry of Darkness and later joining the team, but upon learning that Christian was beaten into telling Ken Shamrock the whereabouts of Stephanie McMahon, The Undertaker punished Christian by flogging him. More loyal to The Brood than to The Ministry, Edge and Gangrel betrayed The Undertaker and rescued Christian from sacrifice.^{[citation needed]}