Follows the adventures of an ever-friendly, helper-builder, Bob, and his crew of fun loving machines. Bob, Wendy, Scoop, Muck, Dizzy, Spud, Lofty, and others work together, solve problems, and build friendships.

In 1120 A.D., the heir to the English throne dies when the royal ship burns at sea. The King calls on his subjects to accept his daughter Maud as ruler until her son comes of age, but the church backs his nephew Stephen. Squire Bartholomew pledges his loyalty to Maud and is thrown in jail, leaving his daughter Aliena and son Richard alone. Maud goes raises an army in France and attacks Stephen. Meanwhile, Tom Builder is destined to construct a cathedral...