The Knights of Can-a-Lot is a 45-minute 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.