The pair have been on a collision course since Brown (22-4) took the title from Urijah Faber with a first-round technical knockout at WEC 36 in November 2008.
Brown, 33, silenced doubters with a second victory over Faber in their rematch at WEC 41 in June. The win was the American Top Team fighter’s 10th in a row.
Also on that card, Nova Uniao’s Aldo (15-1) took out Cub Swanson with a merciless eight-second flying knee, his third first-round stoppage for the promotion. A dynamic technician both standing and on the mat, the 22-year-old Aldo hasn’t tasted defeat since November 2005.