Sister Wives fans are questioning the series’ future as Kody Brown joins Season 4 of FOX’s Special Forces: World’s Toughest Test. TLC has confirmed that Season 20 of the long-running reality series has already been filmed, but Kody’s leap to a new TV competition has viewers wondering if this marks the end of Sister Wives.

'Sister Wives' Kody Brown Joins Another Reality Show originally appeared on Parade. Sister Wives ' Kody Brown is joining the season 4 cast of Fox's Special Forces: World Toughest Test.

Sister Wives star Kody Brown is taking on a new challenge: special forces recruit. Kody is one of 18 celebrities who have signed on to endure some of the harshest, most grueling challenges from the playbook of the actual Special Forces selection process in season 4 of Special Forces: World’s Toughest Test. It premieres September 25 on Fox.