You are misusing alt text. Giving us the episode does not give us the context of the image nor does it help the vision impaired. Please do better and describe the actual image in your alt text
It's not fun for people vision impairment to have no idea what this image even is. Alt text must be used to describe the image tell me what episode and what season of King of the Hill it is not give me the context needed. It takes less than a minute write good alt text
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Besides, this is all automated, doing it manually would be needlessly excessive work, they post new screenshots almost every hour.