A Puzzle to Kickstart the Week

A sweet, simple puzzle to kickstart your week, taken directly from a recent Brian Brushwood "Scam School" episode; and it's one of those grand facepalm-type puzzles, you'll kick yourself for, IF you don't solve it:

Multiply together a long sequence as follows:

(a-x) X (b-x) X (c-x) X (d-x)...... (y-x) X (z-x)  i.e., utilizing ALL the letters of the alphabet once

What will be the end product of this sequence multiplied out???

["Scam School" has been around a long time, but if you've missed it by any chance, you can check out it's many entertaining videos HERE.]
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Answer = 0 ...just before the final two sequence entries listed (but not shown), would be (x-x)