UFC 178: Johnson vs. Cariaso was a mixed martial arts event held on September 27, 2014, at the MGM Grand Garden Arena in Las Vegas, Nevada.

[4] The event was supposed to be headlined by a UFC Light Heavyweight Championship rematch between champion Jon Jones and Alexander Gustafsson.

[7] As a result, a Flyweight Title fight between Demetrious Johnson and Chris Cariaso was moved from UFC 177 to headline this card.

[8] The event marked the return of former bantamweight champion Dominick Cruz, after nearly three years on the sideline, first with a coaching assignment on The Ultimate Fighter 15, then with various lengthy injury rehabilitations.

[13] On August 19, following his release from Bellator MMA, Eddie Alvarez signed with the UFC and made his debut against Donald Cerrone in the co-main event for the card.