Mummies appear throughout the different Yu-Gi-Oh! series. Two different sets appear; one serves as a group of servants to Anubis in Yu-Gi-Oh! The Movie: Pyramid of Light. The other group serves Abidos the Third.
In both of their appearances, mummies serve as basically grunts, accomplishing little other than providing a distraction.
Pyramid of Light
When Yugi Muto, Téa Gardner, Joey Wheeler and Tristan Taylor have their souls sucked into the Pyramid of Light, a group of mummies controlled by Anubis attacks the group. These mummies are defeated when Yugi figured out the use of a dagger that was sealed in a room within the Pyramid. Yugi throws the dagger at an engraving of the Millennium Eye within the room, destroying the pyramid once and for all.
A separate group of mummies appear as servants to one of the seven Shadow Riders, Abidos the Third. The mummified remains of his Egyptian servants, they awaken him when the time comes for him to challenge Jaden Yuki, and pilot his vessel. A group of stereotypical mummies under Abidos' command ambushes Jaden, Alexis Rhodes Chazz Princeton, Professor Banner, Syrus Truesdale, and Zane Truesdale, who are brought aboard the ship. When Jaden defeats Abidos, they return to the spirit world with him.
It is revealed through flashbacks that his servants, when they were alive, intentionally lost their Duels against Prince Abidos, causing him to be known as an unbeatable duelist.
|Abidos the Third||40||Lose (all; flashback)|
Three different servants are known to have dueled Abidos in the past, and lost under fear of being punished. None of their monsters were shown.