On Saturday, September 27th the UFC will hold UFC 178: Johnson vs. Cariaso from the MGM Grand Garden Arena in Las Vegas.

In the main event of the evening flyweight kingpin, Demetrious Johnson, will defend his title against unlikely challenger, Chris Cariaso. Johnson is the first and only flyweight champion in UFC history and will be looking to make the fifth successful defense of the gold. Johnson was one of the top contenders for fighter of year last year and followed that great year up with a dominating performance over Ali Bagautinov in June. Cariaso wasn’t the obvious choice for this shot, but with John Dodson injured Cariaso gets a golden opportunity. Cariaso has won three straight bouts over the past year. The forever underrated Cariaso has been in the cage with the best in the world with his only four losses under the Zuffa banner coming to Renan Barao, John Moraga, Jussier da Silva, and Michael McDonald.

In the night’s co-main event Bellator lightweight champion, Eddie Alvarez finally makes his UFC debut against Donald Cerrone. Alvarez comes over to the UFC after vacating the Bellator title. After year’s of contract litigation and wars with Michael Chandler the Philadelphia native finally makes his first octagon appearance. Cerrone could finally be on the verge of a UFC title shot. “Cowboy” has won four straight and has finished every last one of those opponents.

This is a rare event where there really is a second co-main event worthy fight as Dustin Porier faces Conor McGregor in a featherweight grudge match. The trash talk has been heavy between the Louisiana native, Porier, and the Irishman, McGregor. The outspoken McGregor is undefeated in his first three octagon showings and has quickly vaulted up the rankings due to his brash personality. Porier is certainly McGregor’s toughest test to date and could certainly be the perfect foil. Porier has won three straight since dropping a decision to Cub Swanson in February of 2013. “The Diamond” comes into this one with two straight knockouts over Diego Brandao and Akira Corassani.

From top to bottom this card is just stacked. Under those top three bouts we will see a middleweight contender’s matchup between Tim Kennedy and Yoel Romero and the return of Cat Zingano against Amanda Nunes. If that all isn’t enough the preliminary portion of the card is headlined by former bantamweight champion, Dominick Cruz, returning from a three year layoff to face Takeya Mizugaki.

The action kicks off with two preliminary bouts on UFC Fight Pass at 7 p.m. ET. Those are followed up by four more preliminary bouts on Fox Sports 1 at 8 p.m. ET. The main card finally gets going at the traditional starting time of 10 p.m. ET live on pay-per-view.

Above is video of the official weigh-in and below are full results of that weigh-in. (video is courtesy of the UFC)

Demetrious Johnson (124.5 lbs) vs. Chris Cariaso (124.5 lbs)- for flyweight title
Donald Cerrone (155 lbs) vs. Eddie Alvarez (155 lbs)
Dustin Porier (145 lbs) vs. Connor McGregor (146 lbs)
Tim Kennedy (185 lbs) vs. Yoel Romero (185 lbs)
Cat Zingano (135 lbs) vs. Amanda Nunes (135 lbs)
Dominick Cruz (134 lbs) vs. Takeya Mizugaki (136 lbs)
Jorge Masvidal (155 lbs) vs. James Krause (155 lbs)
Patrick Cote (170.5 lbs) vs. Stephen Thompson (170 lbs)
Brian Ebersole (170.5 lbs) vs. John Howard (170 lbs)
Kevin Lee (155.5 lbs) vs. John Tuck (155 lbs)
Manny Gamburyan (135.5 lbs) vs. Cody Gibson (135.5 lbs)