Check out the extended preview for UFC 212, where Max Holloway finally will find Jose Aldo

Title unification fights are not a regular happening, so when they take place it’s always something out of the ordinary.

Next month’s UFC 212 main event in Brazil will be no different. Plus, there has been plenty of heat building between the world’s top two featherweights. In the headliner, the UFC 145-pound title will be unified when current champ Jose Aldo (26-2 MMA, 8-1 UFC) takes on interim titleholder Max Holloway (17-3 MMA, 13-3 UFC).

Aldo, who’s No. 1 in the USA TODAY Sports/MMAjunkie MMA featherweight rankings, was an interim champ after beating Frankie Edgar in July. But he was promoted when lightweight titleholder Conor McGregor was stripped up the 145-pound belt this past November. After Aldo was elevated to undisputed champion, Holloway, who’s ranked No. 2, then won an interim title with a December victory over Anthony Pettis.

But it’s been Holloway’s near nonstop callouts of the man he calls “Jose Waldo,” as in “Where’s Waldo?,” that have turned the heat up on this impending rivalry.

In the UFC 212 co-headliner, No. 2-ranked strawweght Claudia Gadelha (14-2 MMA, 3-2 UFC), a former title challenger who fell short in a July 2016 fight against champ Joanna Jedrzejczyk, meets No. 3 Karolina Kowalkiewicz (10-1 MMA, 3-1 UFC), who was 10-0 before a recent title loss to Jedrzejczyk in November.

UFC 212 takes place June 3 at Jeunesse Arena in Rio de Janeiro, and the main card airs on pay-per-view following prelims on FS1 and UFC Fight Pass.

Both fights have the proverbial “Fight of the Night” potential written all over them, and the rest of the card is solid, as well.

Check out the video above to see the extended preview for UFC 212 in Brazil.

The UFC 212 lineup includes:

MAIN CARD (Pay-per-view, 10 p.m. ET)

• Champ Jose Aldo vs. interim champ Max Holloway – featherweight title unification bout
• Claudia Gadelha vs. Karolina Kowalkiewicz
• Vitor Belfort vs. Nate Marquardt
• Paulo Borrachinha vs. Oluwale Bamgbose
• Yancy Medeiros vs. Erick Silva

PRELIMINARY CARD (FS1, 8 p.m. ET)

• Raphael Assuncao vs. Marlon Moraes
• Antonio Carlos Junior vs. Eric Spicely
• Johnny Eduardo vs. Matthew Lopez
• Iuri Alcantara vs. Brian Kelleher

PRELIMINARY CARD (UFC Fight Pass, 6:30 p.m. ET)

• Jamie Moyle vs. Viviane Pereira
• Luan Chagas vs. Jim Wallhead
• Marco Beltran vs. Deiveson Alcantra

For more on UFC 212, check out the UFC Rumors section of the site.