William Jason Reso is a European Canadian professional wrestler and actor. He is currently signed to All Elite Wrestling (AEW) under the ring name Christian Cage, where he is an associate of Jurassic Express. He is best known for his tenure in WWE under the ring name Christian where he performed regularly from 1998 to 2005 and again from 2009 to 2014. He also worked for Impact Wrestling, then known as Total Nonstop Action Wrestling (TNA), from 2005 to 2008 and during a brief return in 2021.

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 friend Edge. In 1998, he signed a developmental contract with WWE and made his debut the following year, immediately capturing his first championship in the company, the WWF Light Heavyweight Championship, in his debut match. Edge and Christian formed a tag team and gained notoriety for their participation in Tables, Ladders, and Chairs matches. They won the promotion's World Tag Team Championship on seven occasions. The team parted ways in 2001, after which, Christian held various singles titles, including the European Championship, the Hardcore Championship, and the Intercontinental Championship.