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After an accident in the mysterious lab of maniacal scientist Dr. Simon Barsinister Peter Dinklage, an ordinary beagle unexpectedly finds himself with unimaginable powers and the ability to speak. Armed with a fetching superhero costume, Underdog vows to protect the beleaguered citizens of Capitol City and, in particular, one beautiful spaniel named Polly Purebread voiced by Academy Award nominee Amy Adams. When a sinister plot by Barsinister and his overgrown henchman Cad Patrick Wharburton threatens to destroy Capitol City only Underdog can save the day.