Gilbert Cosme Ramírez (born May 25, 1976), better known by his ring name El Mesías (transl. The Messiah), is a Puerto Rican professional wrestler. He is signed to WWE and Lucha Libre AAA Worldwide (AAA).

Cosme began his career in the International Wrestling Association (IWA) based in Puerto Rico, under the ring name Ricky Banderas. While performing in the company, he won the IWA World Heavyweight Championship five times and held minor championships on fifteen separate occasions, before leaving the company in 2006. On March 12, 2006, he debuted in Lucha Libre AAA Worldwide (AAA), a promotion based in Mexico, as a character named Muerte Cibernética and was involved in an angle where this character was "killed". In November 2006, Cosme was featured in the tapings of the Wrestling Society X television series, where he was the second and last wrestler to win the WSX Championship.

Following a month of performing in the International Wrestling Association, Cosme returned to AAA in a special event, this time under the ring name of El Mesías. In September 2007, the company organized a unification tournament where all the champions and first contenders participated. Over the course of the tournament, he won the GPCW Super-X Monster Championship and IWC World Heavyweight Championship, and on the tournament's finale, he became the first wrestler to win the AAA Mega Championship. While working in Mexico, Cosme signed a contract with Total Nonstop Action Wrestling (TNA) where he debuted as Judas Mesias in September 2007. In March 2008, his association with TNA came to an end and he focused most of his time on AAA. In 2010, Cosme debuted for Puerto Rican World Wrestling Council, where he won the Universal Heavyweight Championship. He also wrestled in Lucha Underground under the ring name Mil Muertes. He reprised the role in Major League Wrestling (MLW), as King Muertes.

Outside of his work within these promotions, Cosme has represented Puerto Rico as a member of Team Rest of the World in the 2015 Lucha Libre World Cup and as the captain of Team International in the 2013 World Cup of Wrestling.

Cosme began training in 1996, when he was instructed by a former wrestler. During this time, he enrolled in the Interamerican University of Puerto Rico located in Bayamón. His major was in computer technology, but after completing two years of study, he decided to begin wrestling full time after meeting Víctor Quiñones. In 1997, after working in the independent circuit, he moved to Mexico and became involved in a project to develop Hispanic talent organized by the World Wrestling Federation (WWF).

Cosme subsequently debuted in the International Wrestling Association (IWA) in 1999. He was given the gimmick of "El Patriota" Ricky Banderas, a name that, according to Cosme, was created by fusing the artistic names of Latin musician Ricky Martín and actor Antonio Banderas. He debuted in Extreme Championship Wrestling (ECW) on that year, working a televised match. Following a period of teaming with Los Boricuas, his character was teamed with Germán Figueroa, who wrestled as Gran Apolo and formed a tag team dubbed La Nueva Generacion, which won the IWA Tag Team Championship three times. On August 21, 2000, in a show in Levittown, Puerto Rico, Cosme's character turned on Gran Apolo. Following this, he joined the company's dominant heel stable, Los Intocables, along with Miguel Pérez and Jesús Castillo. After the stable's dissolution, he was involved in another stable named Starr Corporation, where after Cosme's insistence his character became darker and was renamed "El Mesías" Ricky Banderas. Following this, he teamed up with Shane Sewell in a stable known as Los Hermanos en Dolor. In 2001, Cosme had a tryout match for the WWF and performed in Frontier Martial-Arts Wrestling's 12th Anniversary Show pay-per-view event. He won the IWA heavyweight title for a third time on June 15, 2002, and remained champion until Ray González debuted with the company as "Rey Fénix", in a match that he describes as the best match he had wrestled thus far.

Cosme's gimmick underwent another change when he joined then-dominant heel stable La Compañía, led by Savio Vega. This was followed by his fourth title run after he defeated Gran Apolo on January 6, 2003. He was booked as a heel until October 9, 2003, when Vega's group turned on him. Following this, he feuded with Christopher Kindred under his "Slash Venom" gimmick, which peaked when Vampiro was brought by the company to form a stable which feuded with Gran Apolo and Venom. In 2004, he feuded with Hangman Hughes, Kasey James, El Diamante and Bison. In 2005, he turned heel again, this time leading a stable known as La Cruz del Diablo which feuded with other groups led by Vega and González. Following an angle where he feuded over a number one contender spot, Cosme departed from the company and signed a contract to wrestle in Mexico. He continued making sporadic appearances for the company, including a brief stint in 2007. On July 19, 2009, Cosme was booked to defeat Dennis Rivera in the promotion's tenth anniversary event.

Following the culmination of his contract with the International Wrestling Association, Cosme signed a contract with Lucha Libre AAA Worldwide (AAA). He debuted on March 12, 2006, as "Muerte Cibernética", a rudo (heel) enforcer supposedly brought to the company by Cibernético to feud with "La Parka". This gimmick consisted of Cosme wearing a traditional Mexican wrestling mask, often a modified version of the one used by La Parka. This character feuded with La Parka for several months. This angle came to a conclusion at Triplemania XIV, where Cosme's character was booked to lose a Mask vs. Mask match.