This article explains how to change Alexa's voice to that of actor Samuel L. Jackson. Additional information covers how to switch between explicit and clean versions of his voice.
How to Get Samuel L. Jackson's Voice on Alexa [EXPLICIT 🤬]
You can enable this skill on any of the Echo devices connected to your Amazon account. Follow these steps:
Wake up your Echo device with your wake word.
Launch the skill by saying, “Alexa, introduce me to Samuel L. Jackson.”