When Thomas s loveable dog McGrowl is hit by a car， Thomas is heartbroken. But just when he thinks McGrowl will be lost to him forever， the mysterious vet Dr. Minderbender steps in to save the day. After a strange operation， McGrowl is alive， but he has been changed forever. McGrowl now has super speed， super hearing， and superpowerful sight， smell， and strength -- and a few super-funny tics. Now Thomas and his bionic dog must take on the evil Dr. Minderbender and foil his sneaky plans. Can this one-of-a-kind canine superhero save the day?