Apparently, in an issue of the UK He-Man comics, Hordak disguised himself as the "Dream Mistress," and tried to deceive Stonedar... Stonedar didn't fall for it (lucky for him). [Place your own cross-dressing joke here]
I chose to interpret the Dream Mistress as a shapeshifting entity who works for Hordak as a spy and saboteur. Here she/it is, in both Horde (right) and non-Horde (left) garb:
click above for larger view
The non-Horde version isn't significantly altered, so I threw in the Horde version as a re-design (or alternate costume, at the very least). The pose is rather generic, pretty much just a minor variation of a standby that I go to when drawing women (or shapeshifters that look like women). I was a bit short on time for this one.