In June of 2010, World Wrestling Entertainment (WWE) started airing vignettes teasing the debut of a man named Alberto Del Rio. The video teasers continued airing for two full months, a necessary evil just to give WWE fans time to figure out who exactly the guy was.
Because it's where everyone would go anyway, here's what Wikipedia says:
Before working for WWE, Rodriguez used the name Dos Caras, Jr. as both a mixed martial artist and luchador in mostly Mexico and Japan. He worked in both of Mexico's main wrestling promotions and achieved success in Consejo Mundial de Lucha Libre (CMLL), where he is a former CMLL World Heavyweight Champion.
Son of noted luchador Dos Caras, nephew of Mil Máscaras and Sicodelico, and cousin to Sicodelico, Jr. and Hijo de Sicodelico, Rodríguez is part of one of the most well known Mexican wrestling families. ... The name Dos Caras translates to Two Faces, referring to the symbol of a double headed eagle on his mask.
Del Rio came in with a big push and big plans for the company to continue cultivating the Latino market. That's probably a big reason he debuted on SmackDown on this date in history (Aug. 20, 2010) interrupting a Rey Mysterio promo and eventually defeating him in a match later in the evening.
Fast forward a few years and Del Rio has been a WWE champion, a Money In The Bank winner, a world heavyweight champion, and a Royal Rumble winner. Although he's never quite gotten over with the audience, he's accomplished quite a bit in his short time with the promotion.