Mummy of Ankha
The Mummy of Ankha was the disguise of Dr. Najib. Ankha's appearance seems to based off of that of Kharis from the old Universal horror movies.
Scooby-Doo, Where Are You!
This was Ankha's first appearance. After the kids went to pick up some sandwiches, he broke into the museum and turned the professor to stone. When the gang returns, they find Ankha all over the place. He wanted the Egyptian Coin Shaggy had. After several encounters, it turns out that Dr. Najib and Scooby had been turned to stone. As Shaggy mourns over Scooby's petrification, Scooby digs himself out of the shed a few feet away. After realizing that Ankha didn't really turn Scooby to stone, the gang decides they need to catch him. In the end though, Shaggy and Scooby end up taking a lawn mower ride with him, which ends in Scooby catching him in a basketball goal. The gang then unmasks him to reveal Dr. Najib.