The Mount Rushmore National Memorial (often referred to as Mt. Rushmore) is a location on Earth that was used as a Plumbers base.
- In Secrets, Mt. Rushmore was revealed to be a Plumbers base by Max. It was shown to have multiple pieces of technology, including an arsenal of heavy weapons, all of which could be accessed by pulling open different drawers. This technology was used to enter Vilgax's ship and rescue Ben.
- In Truth, Mt. Rushmore was visited by Phil so he could steal the Null Void Projector. This was because he was making money off of his so-called "heroics," (saving people from aliens), but he was actually releasing them so he could reimprison them to earn money. He, however, was stopped by Ben, Gwen and Max and sent into the Null Void.
- In Ben 10 vs. the Negative 10, Mt. Rushmore was seen, however only the outer location was seen at the end of Part 1. In Part 2, the Tennysons tried but failed to prevent them from breaching the stronghold. They battled inside the room with the Sub Energy but though they defeated and trapped 8 of the Negative 10 members they failed to protect the sub energy. However Perk Upchuck stopped the Forever King by swallowing the energy and making a powerful blast. However, this destroyed Mt. Rushmore and a hologram was used to prevent anyone from seeing the damage.
- In War of the Worlds: Part 1, the team briefly visited a repaired Mt. Rushmore to free Darkstar from the Null Void.
- It was revealed that Mt. Rushmore became a fully functioning Plumber base when Ben was 11 years old.
- In Malefactor, Mt. Rushmore was used to keep a Psycholeopterran safe. Later in the episode, it was attacked by Malware while Khyber took a DNA sample from the Psycholeopterran.
- In Evil's Encore, five years before Omniverse, Dr. Animo took control of the base and tried to use the Plumber satellite network to spread his mutation ray over the Earth. He was stopped by 11-year-old Ben, Gwen and Max Tennyson.
- Mt. Rushmore appears as a level.
- Max Tennyson
- Ben Tennyson
- Gwen Tennyson
- Cooper Daniels
- Red Knight
- Dr. Animo
- Acid Breath
- Smuggled Psycholeopterran
- Mt. Rushmore has been destroyed twice by Perk Upchuck.