Mee-Shee: The Water Giant (2005)

A young boy is devastated when the planned vacation with his father is canceled due to an emergency salvage mission at a remote Canadian lake. But when he discovers the lake is known as the home of a mythical creature, Mac makes it his mission to prove there's more to the myth than just legend. Forging a connection with the creature is easier for Mac than getting his father's attention until both man and beast need all the help they can get.