Moffat explicitly describes the series as a sequel, rather than an adaptation, stating the Jekyll of the original story really existed, and Jackman is his "modern-day descendant dealing with the same problems". As "Jekyll and Hyde" is such a well-known phrase, Moffat labored over what to call the series, eventually deciding upon "Jekyll" because that word "carries the name Hyde". The final episode replaces the title "Jekyll" with "Hyde". Producer Elaine Cameron says the one word title gives the series a "very modern feel". Moffat initially named the character Jekyll rather than Jackman, but found it cumbersome to constantly explain that the book had not been written in this alternate universe. Instead he chose a version where the book exists, but changed the name to Jackman. Otherwise, Cameron felt, the character would appear stupid by not realising what was happening when turning into Hyde.