In July 2008 Mr. Niebla returned to CMLL, forming a group with Negro Casas and Heavy Metal called La Peste Negra (Spanish for "the Black Plague), a Rudo group that had a more comical approach to wrestling. The trio started wearing large afro wigs, painting their faces black and dancing during their entrances and generally worked a less serious style of match than was unusual, especially for a serious wrestler like Negro Casas. On September 2, 2008 the last Casas brother, El Felino turned Rudo as well and joined La Peste Negra. After Felino joined the group Heavy Metal was quietly phased out as he was not comfortable working the comedic style. Felino's wife Princesa Blanca joined the group in early 2009, turning Rudo to work with La Pestra, the turn led to Princesa Blanca winning the Mexican National Women's Championship from Marcela on January 30, 2009. La Pesta Negra's biggest triumph to date is Negro Casas' title win over Místico that brought the CMLL World Welterweight Championship into the group. After the title win, La Peste Negra continued their feud with Místico and his various allies. The feud led to Místico and Negro Casas facing off in a Lucha de Apuesta on the CMLL 76th Anniversary Show, where Casas lost two falls to one and had his hair shaved off. After the match Místico challenged El Felino, Casas' cornerman, to an Apuesta some time in the future although nothing came of it at the time.
In early 2010 El Felino began a storyline feud with La Sombra. The feud began on February 2, 2010 with a singles match between El Felino and La Sombra, after each wrestler won a fall a Puma King, El Felino's nephew, showed up wearing an El Felino outfit and mask, distracting both the referee and La Sombra long enough for El Felino to land a low blow on La Sombra to win the match. The two met in a Lighting match (a one fall, 10 minute time limit match) on the February 19 CMLL Super Viernes show. Once again Puma King tried to help his uncle, but this time the referee disqualified El Felino for the transgression. After the main event of the February 21's show between Místico, La Máscara and Negro Casas against Volador, Jr., Último Guerrero and Héctor Garza Místico challengede Volador,Jr. to a Lucha de Apuesta, or bet match, between the two with their masks on the line. During the main event La Sombra came to Volador, Jr's aid while El Felino helped Místico. On the February 26 CMLL Super Viernes show it was announced that Místico, Volador, Jr., La Sombra and El Felino would face off in a four way Lucha de Apuesta match as the main event of the 2010 Homenaje a Dos Leyendas. La Sombra was the first man pinned at Dos Leyendas and El Felino was the second, forcing the two to put their masks on the line. After a long match La Sombra pinned El Felino. After the match he unmasked and announced that his real name was Jorge Luis Casas Ruiz. On September 30, 2011, at CMLL's 78th Anniversary Show, El Felino won Rey Bucanero's hair in a ten man steel cage match. In October 2011, El Felino became one of four CMLL wrestlers featured in an A&E Latinoamericano documentary series titled El Luchador. In late 2011, El Felino began feuding with Blue Panther, which led to a Hair vs. Hair match on December 16 at Sin Piedad. A week prior to the match, Panther was disqualified in a tag team match, after giving El Felino a Martinete. This led to the Distrito Federal Box y Lucha Commission announcing that Panther was suspended for two weeks, starting after the December 16 event. At Sin Piedad, El Felino tried to exact revenge on Panther, but was disqualified after the referee caught him going for a Martinete. As a result, El Felino was shaved bald. El Felino was teamed up with tecnicoEl Hijo del Fantasma for the 2013 Torneo Nacional de Parejas Increibles ("National Incredible Pairs Tournament"), a tag team tournament teaming rudos with technicos. The team lost to La Máscara and Averno in the first round despite Averno and La Máscara being long time rivals. On March 15, 2013 El Felino teamd up with his sons Tiger and Puma to defeat the team of Guerrero Maya, Jr., Delta and Tritón in the opening match of the 2013 Homenaje a Dos Leyendas. On February 18, 2014, El Felino, Mr. Niebla and Negro Casas defeated La Máscara, Rush and Titán to win the Mexican National Trios Championship.