[2] Pérez also stated that during his career he was inspired by the microphone skills of Chicky Starr and The Rock and by the in-ring ability of Kurt Angle.

[1] While visiting an event presented by the IWA in Carolina, Puerto Rico, Pérez was approached by Víctor Quiñones then president of the company, who asked to him if he was interested in receiving training to become a professional wrestler.

[2] His first angle with the company was as the leader of a group of young wrestlers titled Lucha Libre 101, originally composed of Bryan Madness (Roberto Rubio), Chicano (Carlos Cotto) and Abbad (Enrique Sinigaglia).

He was assigned to their developmental territory, Deep South Wrestling and began working under the pseudonym "The Puerto Rican Nightmare" Eric Pérez.

[5] On February 23, 2008, Pérez and Colón, collectively known as The Puerto Rican Nightmares, defeated Steven Lewington and Heath Miller in a tournament final to become the first-ever FCW Florida Tag Team Champions.

On December 11, Pérez won the FCW Florida Heavyweight Championship, defeating Sheamus O'Shaunessy, Joe Hennig and Drew McIntyre in a fatal four-way match.

During the following months, while still holding the title, Pérez performed on several dark matches prior to the tapings of WWE's main brands, working under his developmental ring name.

A couple of weeks later, Pérez performed a sketch in Spanish, deeming himself the future talent of WWE, subsequently defeating Kizarny.

As his promotion to the main roster approached, a character based on Jonathan Goldsmith’s The Most Interesting Man in the World was pitched for Pérez by writer Jenn Bloodsworth, vignettes for it were recorded but the concept was ultimately abandoned.

[10] In his in-ring debut, he defeated Matt Hardy by pinfall, receiving a spot in the brand's team for the first edition of WWE Bragging Rights.

During this timeframe, Pérez worked dates in Florida including his debut in American Combat Wrestling defeating ACW Kombat Champion Kennedy Kendrick.

He returned to the World Wrestling Council in their annual event, "Camino a la Gloria", where he was included in a feud with BJ (Benjamín Jiménez).

[23] After leaving the IWA due to unspecified monetary differences in the fall of 2011, he joined the Puerto Rico Wrestling Alliance, a regional independent promotion.

[26] In January 2013, Pérez was reintroduced by Hugo Savinovich as "Mr. E", reforming his team with Rubio and performing as one of the main talents in the World Wrestling League, a promotion based in Puerto Rico.

On September 6, 2013, Los Mamitos defended their titles by defeating the AAA World Tag Team Champions, The Mexican Powers (Crazy Boy and Joe Líder).

However, since Pérez had his boot in the ropes while the referee counted, WWL General Manager Rico Casanova ruled that the World Tag Team Championship could not change hands.

[28] While the two promotions were involved in a working agreement, Pérez made appearances in WWC, where he performed under a mask as a character known as "The Alien" and was assigned José Huertas González as manager.

Rubio suffered an injury and while he recovered, Pérez reverted to his former ringname of Escobar and was involved in an angle where he was portrayed as mentally unstable.

On March 21, 2015, Perez participated in the International Cup tournament and defeated Shane Sewell in the final to win the eponymous trophy.

On August 16, 2015, Pérez participated in Sin Piedad but did not wrestle, instead attacking IWRG Rey del Ring Ricky Cruz and taking that title with him.