Suggestions on what evidence to submit for Voice Actor - Dubbing category?

I wanted to update a credit on one of my favorite English voice actors roles, as it only lists him in one episode when I know he's the main character and I know he's in the whole series.

However when I looked at the rules for updating this particular category, I saw that it is required that you submit evidence in order for IMDb to update it. 

The only way that I know how to do it is to take a screenshot of the credits listing him at the end of the episode. However it's only available on one streaming service and I already canceled the subscription I really don't want to have to reapply it just to get screenshots of the credits. 

I asked this because it's an episodic series and I know each episode has to be individually marked, so theoretically I would need proof for each individual episode and I can only think of the credits of the episode to be used in this instance.

Is there any other way that I can update his IMDb successfully without screenshots of the credits listed in the episode? Any suggestions are appreciated.