Two of the greatest fighters in UFC history make their Octagon returns after long layoffs when Jon Jones defends the heavyweight championship against two-time former champion Stipe Miocic in the main event of UFC 309.

Jones has cooled on the idea of fighting his next challenger, should he defeat Miocic. British fighter Tom Aspinall has held down the division as interim heavyweight champion — a title necessitated by Jones’ lengthy absence — and has been chirping for months about a unification bout.

Former UFC title challengers Chael Sonnen and Anthony Smith, as well as retired lightweight contender Paul Felder will serve as a desk analysts on the UFC 309 post-fight show and throughout the card, when necessary. Brendan Fitzgerald will serve as the host.