Lupita Nyong'o, Catherine O'Hara on Emotional 'The Wild Robot'

Lupita Nyong'o, Catherine O'Hara and the cast of "The Wild Robot" have a suggestion for moviegoers wanting to see their new animated film: Bring tissues to the theater. The movie, a sci-fi survival story about a robot that's marooned on an uninhabited island, debuts on Sunday night at Toronto Film Festival and may prompt moviegoers to shed a few tears. As the android ROZZUM unit 7134, who goes by Roz (voiced by Nyong'o), learns to adapt to the harsh surroundings, she gradually builds relationships with other animals on the island — O'Hara voices a droll mother possum called Pinktail, Kit Connor plays an orphaned gosling named Brightbill, Mark Hamill is grumpy grizzly bear Thorn — and starts to raise Brightbill.

But teaching the runt of the litter to eat, swim and fly before migration season is something that proves to be more difficult (and sentimental) than Roz is programmed to handle. Stephanie Hsu voices another robot named Vontra, but let's just say her character won't be pulling at any audience's heartstrings. "I've watched it only one time, but it was heartwarming at the end of the day," Nyong'o said at Variety's Toronto Film Festival studio, sponsored by J.



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. Rebecca Rubin.