There's A Viking In My Bed is a TV adaptation of the Jeremy Strong book of the same name. The series was broadcast on CBBC in 2001. The series features Clare Thomas who would go on to appear in Young Dracula.
The Television series, just like the book, is about a 10th century Viking named Siggy who finds himself stranded in a present-day seaside town. He meets a young boy who takes him back to his parents hotel and convinces them to allow siggy to stay.