Someone tell me what this odd TV issue is

So I'm watching cartoons with my kids this morning and the last cartoon only had secondary audio. By that I mean background music. No voices at all. My kids didn't complain, and I explained to them that something was wrong at the cable company probably.

But now something really weird is going on. A new cartoon is on - the voices are back - but there is a voice of a guy describing the action. It's almost like a service for blind people. It doesn't repeat voices - it just describes things you wouldn't know if you couldn't see the visuals.

Anyone know what this?

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