Analysis of information sources in references of the Wikipedia article "Leonardo Cimino" in English language version.
From out of the shadows emerges a familiar face: the Baron's Doctor (Leonardo Cimino). Thought to be the only speaking part created specifically for Dune by [David] Lynch, we learn this Doctor was actually Scytale, a shape-shifting "face dancer" crucial to the plot of Herbert's second book [Dune Messiah]. Going back to Dune '84, you may not have noticed Cimino's Doctor accompanied Baron Harkonnen during the Arrakeen attack. The Doc is absent after that, even as the Baron yells creepily, "Where's my doctor?" That's because Doc/Scytale absconded with Duncan's body. This Easter egg is Lynchian world-building at its best.