UFC 121 takes place Oct. 23 at the Honda Center in Anaheim , Calif. .
UFC 121 is headlined by a heavyweight tilt between current champion Brock Lesnar and challenger Cain Velasquez .
UFC 121 takes place Oct. 23 at the Honda Center in Anaheim , Calif. , and is headlined by a heavyweight tilt between current champion Brock Lesnar and challenger Cain Velasquez .