After the encounter with the mysterious mummy with Todd, Ben is given the ability to transform into the alien he now calls Benmummy. Benmummy has the appearance of an egyptian mummy, but with large gripping hands with an ability to stretch his fingers out to a length he can use to constrict his enemies. The body is mainly made of thread-like material that appears to be limitless, and continually extends out from Benmummy's head, allowing him to extend bandages to no end. And without a physical body, he is able to survive tremendous damage, even if he is thrown into the shredder.

Benmummy is a Ther-Khufan from the planet, Anur Khufos.