Pooh's Grand Adventure: The Search for Christopher Robin

It's sad when your best friend goes away, and that's what happens in this straight-to-tape extension of the Winnie the Pooh franchise: Disney deep-sixes the charmingly assertive inhabitants of the Hundred Acre Wood and substitutes a band of self-pitying impostors who seem all too aware of their capacities for failure. In Pooh's Grand Adventure: The Search for Christopher Robin, Pooh — suddenly credible as ''the bear of very little brain'' — remains sweet as honey, but after Christopher Robin mysteriously disappears, fussy Rabbit gets a bit Napoleonic, and Eeyore takes a turn toward clinical depression. Aping the message of The Lion King (and The Wizard of Oz), this treacly musical fantasy in no way matches the grown-up wit or toddler psychology of the four A.A. Milne stories Disney adapted so long ago. C