Toy Story 4 (UHD Release 2019-10-8) is good.  It delivers a new adventure, new characters, and most importantly brings back Bo Peep, who mystified me by disappearing from the prior installments.  I do not not want to call it an unnecessary sequel, but its theme of being abandoned by kids has already been explored before.  I kind of like the ending because of Bo Peep, but overall it is overshadowed by the perfect Toy Story 3.