While trying out the spy glasses, spy hat, and other items in their new spy kit, seven-year-old Henry and his dog Mudge make a new friend and form a spy club.
Concerned that the family is spending too much time in front of the television and neglecting other activities, Mama Bear decides that there will be no television watching for one week.
The big engines tease Thomas and say he can't do anything because he's little but he proves them wrong when he finds the missing golden engine and brings back the Magic Railroad to the Island of Sodor.
"After causing a family commotion when they fight with each other, the Berenstain cubs learn that sometimes even the best of friends don't get along."--Title page verso.