The event billed as the biggest in Ultimate Fighting Championship history will be tonight from Las Vegas with UFC 200.

The event will be headlined by a fight with Miesha Tate defending her title against Amanda Nunes.  Ronda Rousey is scheduled to appear in the post-fight and will likely challenge the winner for the title.

Former heavyweight champion Brock Lesnar also returns to the Octagon for the first time since December of 2011 and will face contender Mark Hunt.

Other bouts on the card include Frankie Edgar facing Jose Aldo for the interim featherweight belt and Cain Velasquez taking on Travis Browne.

Daniel Cormier was set to main event the card, but will now face Anderson Silva in a non-title fight due to Jon Jones testing positive for a banned substance.

The official pay-per-view card will get underway at 10 p.m. tonight.

Full Card

Miesha Tate © vs Amanda Nunes (For the Batamweight Title)

Brock Lesnar vs Mark Hunt

Daniel Cormier © vs Anderson Silva

Jose Aldo vs Frankie Edgar (For the Interim Bantamweight Title)

Cain Velasquez vs Travis Browne

Cat Zingano vs Julianna Pena

Johnny Hendricks vs Kelvin Gastelum

TJ Dillashaw vs Raphael Assuncao

Sage Northcutt vs Enrique Marin

Diego Sanchez vs Joe Lauzon

Gegard Mousasi vs Thiago Santos

Jim Miller vs Takanori Gomi