Jack and the Quack is a cancelled episode of Jack and the Sodor Construction Company.
The Maithwaite village pond is home to a family of ducks which the children love to feed. The pond is in need of dredging so Jack is assigned to enter the pond and scoop out silt. Jack is over-enthusiastic and damages the bottom of the pond. All of the water drains away and the ducks disappear. Jack is ever so disappointed and asks to stay behind after work to look for the ducks. He looks everywhere and soon falls asleep.
Overnight, a summer storm breaks out. When Jack wakes in the morning, he is surprised to see the family of ducks have found a new home in his rain-filled scoop.