Eon's Servants

Eon's servants are robots that serve and help Eon.

Appearance
In Ben 10: Race Against Time, Eon's servants are completely black, except their faces, wearing a brown tunic and a helmet with mirror effects. Without their helmets, they have grey skin, closed eyes, pig-shaped noses, and wrinkly face.

In Ben 10,000 Returns, Eon's servants are all alternate versions of Ben.

In Ben Again and Let's Do the Time War Again, Eon's servants wore suits similar to the ones in Ben 10,000 Returns, and were never unmasked.

Race Against Time
When they first appear, Eon has them fight Heatblast. After a short fight, they were defeated.

Later, they were seen with Eon hidden in the Clock Tower. In there, Eon suffers a headache. One of his servants tries to help, but he prevents this and attacks him, cruelly ordering the others to "let him die".

Eon uses them only to gain the advantage in battle and to do some of his dirty work.

They appear for the last time when Ben (as Eon), calls for them and they took the Plumbers' weapons away. They were then destroyed when Ben regained control over his form.

Ultimate Alien
In Ben 10,000 Returns, Eon used his servants to attack Ben 10,000, but they were all defeated. They later appeared in the present, fighting alongside their master. After Gwen used a spell to freeze them, it was revealed that they were alternate versions of Ben himself, who had their powers drained and placed under Eon's control. When Eon vanished from this universe with the destruction of the Hands of Armageddon, everything he did was undone and the alternate Bens were returned to their respective timelines.

Omniverse
In Ben Again, Eon summons his servants to aid him in the final battle. They resemble their Ultimate Alien selves, but since the alternate Bens were restored to their own time and place after Eon's previous defeat, now they are just robots.

In Let's Do the Time War Again, they battled Big Chuck who ate and defeated most of them.

Ben 10

 * Ben 10: Race Against Time (first appearance)

Ben 10: Ultimate Alien

 * Ben 10,000 Returns (first re-appearance)

Ben 10: Omniverse

 * Ben Again (first re-appearance)
 * Let's Do the Time War Again

Trivia

 * Eon's servants' red energy swords bear a striking resemblance to the lightsabers in the Star Wars franchise.
 * They are believed to be previously enslaved humans or creatures belonging to Eon's planet, a race of the same species, limbs of the same species and under-age mutants, or beings from another dimension. The pop-up version of Race Against Time states that they were humans Eon has plucked from different points in time (which is only partially true).