Brock Lesnar competed in UFC between 2008 and 2011, making an one off appearance at UFC 200 in July 2016.
Lesnar has competed eight times for the company in total, winning four, losing three and with one No Contest.
Lesnar made his name as a professional wrestler, competing for WWE most famously, between 2002 and 2004. He also competed for New Japan Pro Wrestling between 2005 and 2006.
In 2007, he made his debut in MMA, a logical career path for him, considering his excellent record as an amateur wrestler, which saw him win the NCAA Division 1 title twice.
Lesnar's career in UFC began the following year to much fanfare and also derision from a large section of the MMA fanbase who regarded him as a "fake" wrestler.
Lesnar didn't start at the bottom of the food chain however. He was immediately booked to fight former Heavyweight Champion, Frank Mir in his UFC debut at UFC 81, in February 2008. Despite dominating Mir, Lesnar got caught by a heel hook and was forced to tap out. His first fight in UFC had ended in defeat.
Lesnar bounced back of course. He would reign as Heavyweight Champion between 2008 and 2010 and compete in many thrilling bouts before he retired from the sport due to health issues and rejoined WWE in 2012.
Lesnar made an unexpected return to the Octagon in 2016 for UFC's 200th pay per view (in actuality it's 201st, owing to UFC 37.5), where he defeated Mark Hunt in an impressive performance. However, the result was later overturned when Lesnar subsequently failed two drug tests.
Now In December 2018, Lesnar has re-entered the USADA testing pool and is expected to compete in the Octagon again in 2019. Whether it is against current Heavyweight Champion. Daniel Cormier remains to be seen.
In the following slideshow SK relives the five best Brock Lesnar fights in UFC.
#5 Alistair Overeem - UFC 141 (December 30, 2011)
Brock Lesnar returned from a lengthy lay off to fight Alistair Overeem in what proved to be his final MMA fight in five years.
Lesnar was coming off his loss of the Heavyweight Championship and was attempting to get back into contention versus another top contender in the division. However, Lesnar looked a shadow of his former self in this entertaining bout, that was one sided, admittedly in favour of Overeem.
Lesnar threw a leg kick first up and both men began to trade blows. Overeem took control when he landed heavy knees which caused the "Beast" to double over in pain.
Lesnar tried to punch his way back into contention but Overeem withstood the assault and unloaded some big left hands followed by a huge leg kick to the body, causing Lesnar to stumble to the mat. Overeem jumped on top of him and unleashed a barrage for the TKO win.
A memorable match; just not a good result for Lesnar.