[quote]When Superman II was first broadcast on TV, most of the Donner shoots were included.[/quote]
Most of the extended footage was filmed by Donner in 1977 however most of Donner's footage has never been seen to the public. The extended version added 24 minutes of extra foootage, roughly about 20 minutes of this is Donner material. There still remains a vast amount of footage out there in a vault at Pinewood Studios. Warner Bros. have since negociated a deal with the Salkinds to release all the Donner material. There will be a special edition of Superman II next year, whether it's an extended cut or a Donner recut I don't know. Still a lot of footage in the theatrical cut is Lester's so I don't know how they could get a Donner cut without using some Lester footage.
Margot Kidder in 2004 announced that there were reels of film to recut this movie to just be Donner's movie. Notable scenes missing from the theatrical cut filmed by Donner include
Daily Planet Opening - Lois being rescued by Clark after she throws herself out the window. She has drawn glasses over a picture of Superman and believes Clark is Sups. She lands on a fruit cart thanks to some super intervention from Clark.
The Niagra Falls scenes - Lois shoots Clark with blanks to prove he's Superman.
Dramatically Extended Lex footage - Lex and Miss T finding the fortress plus the extra prison stuff. (shown on Tv extended cut)
All Marlon Brando footage - Susanna York was never suppose to be in the movie. Marlon Brando shot loads of scenes including Superman losing and regaining his powers.
The alternate ending. Villians being carted off by the arctic police, Sups blowing up the fortress of solitude, Lois and Sups break up scene (shown on TV extended cut)
The above is just a summary.