Val Chmerkovskiy, Mandy Moore also are on board
Crowdfunding is underway to donate to LGBT organizations
The 'Roseanne' spinoff will focus on the family without Barr's involvement
The couple will have a 'complicated' relationship
The premiere is set for Sept. 12
The actress will portray Nia Nal (aka Dreamer)
The character will be introduced in the Arrowverse crossover in December
The comment visibly upset his fellow houseguest
The show will air in select countries overseas on HBO Go
The new episodes will take place in Kansas City, Missouri