My Custom Grayskull Guards were painted by me. I used Standor bodies with Skeletor loincloths & Palace Guard Armor. I bought the heads & armor Plate from Orsogranito Granitebear Shop. The Grayskull Guards appear in the UK LadyBird books Castle Grayskull Under Attack! & Warlord of Eternia.
The Sentries were created to defend the castle & assist Queen Grayskull while The Goddess was away. After the disappearance of Sir-Laser-Lot, The Goddess reversed the deaths of King Grayskull's Knights with the zombie spell that was later used to raise Megator. She infected the knight's bodies with He-ro's techno-organic virus to preserve their intelligence. Over time these Sentinels completely transformed into robots but with the minds of men. These ancient robots reside in Castle Grayskull's Secret Chamber of Defense until they are activated by He-Man or The Sorceress to guard Castle Grayskull.