Of those which haven't been adapted yet.
Mister Ed
Mister Ed: Gary Oldman
Wilbur: Peter MacNicol
Carol: Nicole Kidman
Roger Addison: Gregory Itzin
Kay Addison: Conchata Ferrell
Diff'rent Strokes
Arnold: Norman D. Golden II
Willis: Bring back Todd Bridges.
Kimberly: Elle Fanning
Mr. Drummond: Mitch Pileggi (You gotta admit it would be really funny)
Mrs. Garrett: Bring back Charlotte Rae.
Okay, I suck at casting, but who cares. This is for fun.
Mister Ed
Mister Ed: Gary Oldman
Wilbur: Peter MacNicol
Carol: Nicole Kidman
Roger Addison: Gregory Itzin
Kay Addison: Conchata Ferrell
Diff'rent Strokes
Arnold: Norman D. Golden II
Willis: Bring back Todd Bridges.
Kimberly: Elle Fanning
Mr. Drummond: Mitch Pileggi (You gotta admit it would be really funny)
Mrs. Garrett: Bring back Charlotte Rae.
Okay, I suck at casting, but who cares. This is for fun.