Purple Dimension
Ruled By: Aggamon.
This pocket-dimension is ruled by Aggamon, the Sorcerer Supreme of a race of green-skinned humanoids who abduct humans for slave labor. The abduction is through a mystical purple gem, specifically placed in Earth's dimension for that purpose (similar to Tiboro's Screaming Idol). It is called the Purple Dimension because "one must pass through the purple veil to get to it". This was the second dimension Doctor Strange ever visited and he forced Aggamon to free the slaves and stop his abductions, but things may have changed since then.