Works such as TV series, comics and sometimes even whole novels are sometimes published in multiple parts making up a complete story arc. The individual elements of such a story arc are always eligible for their year of publication. However, voters may want to nominate a complete story arc. In such cases it is the publication date of the final installment of the series that counts for eligibility purposes.
If an individual installment of a story arc achieves a nomination on its own then the complete story arc will probably be ruled ineligible if nominated. This is because the voters have clearly indicated that the installment stands on its own as a complete work and is not part of a longer work. (The same would apply if, for example, book 1 of a trilogy were to be nominated on its own.)
Interestingly it seems computer games can also be nominated in long form dramatic. A push to get eg Mass Effect (either 3, or the whole series) nominated next year might be interesting.
Edited by Seli, 10 April 2012 - 05:22 AM.