The Boblins are the one-shot minor antagonist of the reboot TV series, Ben 10, first appearing in the episode, Cutting Corners.
Ben transformed to Upgrade and upgraded the lawnmower and accidentally trespassed the Boblin territory. This makes the Boblins angry at Ben for what he did. They wanted to have revenge on the people, especially Ben. Ben transformed into Stinkfly and stopped them from attacking before he transformed into Wildvine to regrow the bush. Because of this, the Boblins stop attacking.
The Boblins appeared as small greyish green humanoid creatures with pointy ears. They also appeared to wear medieval outfit. The Boblin King wears a very different atirre. His attire is brown with a fur cape and acorn hat.
The Boblins are very vengeful to anybody who trespassed their territory. They even want to use catapults and other vengeful ways. They are also shown to lack intelligence.