When Brock Lesnar made his UFC debut against fellow Heavyweight Frank Mir, his impact was immediately felt by both MMA fans nationwide, and Mir himself.
One minute and thirty seconds later, Lesnar had his short, stellar outing ended by a kneebar from Mir. And so the learning experience began.
Since that outing, Lesnar has demolished Heath Herring and UFC legend Randy Couture, en route to the UFC Heavyweight Championship belt.
Mir has also done well for himself since the bout with Lesnar, defeating Antonio Rodrigo Nogueira to gain the UFC interim Heavyweight Championship.
However, come this July at UFC 100, there will be only one unified champion, and this slideshow will tell MMA fans why that champion will be Brock Lesnar.