The Mask of Ah Puch is an old mask artifact that first appeared in the episode Ultimate Weapon.
As shown in the episode, it can lead the one who wears it to the legendary Sword of Ek Chuaj.
The mask is first seen discovered by workers who are working to obtain some oil underground. An earthquake alerts them and they run as the ground breaks up while the tower falls below. The mysterious quake unearths a large tornado of flames, which then reveal to them to the mysterious mask. Meanwhile, aboard the RV Max is alerted about the discovery of the mask and after telling the Mayan legend to his grandchildren he arrives at the place where it was discovered. Using Grey Matter Ben uncovers the mask. However, the Forever Knights led by Enoch arrive and just as a fight is about to erupt, a security guard comes and manages to distract the group.
After a brawl, Enoch gets his hand on the mask and the Tennysons follow Enoch to prevent him from obtaining the sword of Ek Chuaj. During another brawl, Max manages to get the mask and Ben using the Max learns about the coordinates of a temple and transforms into Stinkfly to get there. After going through the temple they find the socket where he mask can be placed but Enoch arrives and he manages to throw the Tennysons into the pit of despair. However they are saved thanks to Four Arms and they witness Enoch wielding the sword. However the sword crumbles down due to it being old and the Tennysons escape the temple as they have foiled Enoch's plan.
- Ultimate Weapon (first appearance)