Losbter Productions

Here you can watch Unraveling the Mystery: A Big Bang Farewell, the special interview behind the scenes with Kaley Kuoko and Johnny Galecki.
You can watch all "The Big Bang Theory" seasons here: 
https://europixhd.net/tvs/the-big-bang-theory-online/the-big-bang-theory-season-12-hd-with-subtitles-europix