Gordon has problems with his fire; Thomas suggests the cause is gremlins, and later collects a special passenger. At Wellsworth, the passenger's Dalmatian runs away and, after confronting a bull runs into Thomas' cab. At Brendam, Thomas enquires about the visitor, and Sir Topham Hatt reveals she is his mother, Dowager Hatt, who then aptly renames her dog "Gremlin".

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