Edwin "Eddie" Carlos Colón (born December 21, 1982) is a Puerto Rican professional wrestler. He is currently signed by WWE wrestling on its Raw brand as Primo. He is the son of Carlos Colón, Sr. and the younger brother of wrestlers Stacy and Carly Colón, better known as Carlito in WWE. He began wrestling in the World Wrestling Council, where he won the WWC Universal Heavyweight Championship five times, as well as numerous secondary and tertiary titles.

In 2007, Colón signed a developmental contract with WWE, being assigned to Florida Championship Wrestling. In this promotion he was teamed with Eric Pérez, forming a tag team known as The Puerto Rican Nightmares. On February 23, 2008, they became the first wrestlers to hold the FCW Florida Tag Team Championship. Upon being promoted to the main brand, he was teamed with his brother. Subsequently, The Colóns became the first team to hold the WWE Tag Team Championship and World Tag Team Championship at the same time, making them the first Unified WWE Tag Team Champions.

Rey Gutierrez Mysterio Jr. (born December 11, 1974) is a Mexican American professional wrestler in World Wrestling Entertainment currently wrestling on the RAW Brand. In WWE, Gutierrez was trained by his uncle Rey Misterio, Sr. and wrestled early on in Mexico where he learned the Lucha Libre high flying style that has been his trademark.

Gutierrez originally worked for Asistencia Asesoría y Administración (AAA) in Mexico, from 1992 to 1995. He wrestled in Extreme Championship Wrestling (ECW) from 1995 to 1996 and World Championship Wrestling (WCW) from 1996 to 2001, as Rey Misterio, Jr./Rey Mysterio, Jr. but dropped the "Junior" from his name when he began working for WWE in 2002.

Mysterio is known for having a high flying style, which helped kick-start the cruiserweight wrestling revolution in the United States in the late 1990s during his time in WCW. In WCW he won the WCW World Tag Team Championship three times, and the WCW Cruiserweight Tag Team Championship once with Billy Kidman as part of the Filthy Animals. In WWE, Mysterio is a three time world champion having held the World Heavyweight Championship twice, the WWE Championship once and is currently listed as the lightest world champion in WWE history. He has also held the WWE Tag Team Championship a record-tying four times, and the WWE Intercontinental Championship twice. He also held the WCW/WWE Cruiserweight Championship a record eight times (five times in WCW, three in WWE). All totaled, he has won 21 titles between WWE and WCW. Mysterio was the 21st person to win the WWE Triple Crown Championship, and was the winner of the 2006 Royal Rumble.