Gisella Moretti, an Italian actress, plays the role of Lady Holle in "The Holle 40." Although her appearance in the episode is relatively brief, Moretti's performance leaves a lasting impression. Her character is depicted as a strong-willed and independent woman, who is not easily swayed by Blackadder's charming words. Moretti's portrayal of Lady Holle adds a delightful touch of femininity and sophistication to the episode, making her a memorable guest star in the series.