I believe the amazing race in america recently did this combining past contestants of big brother, survivor and the amazing race.
I'm not talking about a CBB length series btw I'm talking a full on civillian series length of 2 months+ with the biggest characters from those four shows. Possibly even with CBB and International BB stars as late additions if you wanna make it even more groovy.
Would you want this and who would be in your line up? Mine would definitely include
Nikki & Pete from BB7,
Michael from BB9,
Hughie from BB17,
Gina from BB14,
Lewis F from BB19,
Maura from LI
Ovie from LI
Tiffany from CBB
Ika from BB Canada
Tim from the Circle
Chris from LI
Kem from LI
Camilla from LI
Tim from BBAU/BBCAN
Steven Uguolah from the Apprentice
Lottie from the Apprentice
as well as probably loads others.