The surreptitious slingshot slayer strikes at supper

The SSS strikes at supper.
One S worse than the SS, with inhibitions a great deal less, one must confess his fangs resemble so those of a critter of the Loch Ness, but bigger still, he is one with whom you should not mess.

Unless, (allow me to digress), a vial of kryptonite should you possess, and thus and only thusly so thrown into great distress, the SSS may find his powers to impress

a great deal less.