The Knights of Can-a-Lot is a never-televised adventure starring Bob the Builder, otherwise dubbed "Sir Fix-a-Lot". When Bob's dad, also called Bob, arrives for an unexpected visit, a simple case of mistaken identity lands Bob junior and his crew a big job restoring a crumbling castle--under the leadership of Bob senior. Problem is, Bob's dad isn't quite up to the role of foreman, nor are Bob and Wendy comfortable taking orders from him. Naturally, the construction crew steps up to the challenge, assuming names like "Sir Roll-a-Lot" and "Lady Dump-a-Lot" and learning all about medieval castles and legends as they work. When Bob and his Dad get locked in the dungeon, they have a heart-to-heart discussion that reveals the importance of honesty and teamwork. After the restoration is complete, Bob's mum joins her family, the construction crew and the historical society for a celebratory medieval pageant. This Bob the Builder episode is rich in history and construction fun.