How can I add all the episodes in a series to a list in one go?

Hi @martinthomas_2201116,

Unfortunately, the option of adding all episodes to a user list is not implemented yet.

The simplest way is to copy an existing list of another user and then edit the result according to your needs.

For example, if you need all episodes of VandaVision, then search for the related lists (not implemented also) using your favorite search engine:

"WandaVision" site:www.imdb.com/list/*/

The result can include some lists based on the episodes.

Visit the list page, select Actions then Copy:

and follow the instructions.

When there is no existing list or you prefer to create your own list from scratch, then you will need a script to solve this problem dealing with big volume of episodes.

By the way, you reminded me of a long-standing idea that was not published, so you are welcome to vote for or against it, if you wish: 

Feature to add all episodes of a series to user list