Aw, come on. Can't you feel this guy's funky flow?
|—Steven, in "Marble Madness"|
"Plug Robonoids" are reconnaissance drones deployed from the Gem Homeworld to accomplish special missions, such as surveying foreign planets without the aid of a Warp Pad or transportation of a space vessel. Plug Robonoids first appeared in "Marble Madness", as bigger versions of the Flask Robonoids. Plug Robonoids were sent to Earth to Kindergarten in order to monitor The Cluster under Peridot's supervision.
The Plug Robonoid is a noticeably larger variant of the Flask Robonoid. It has seven conical legs and appears to be somewhat transparent, but with an aquamarine-like color. It can change its shape when the circumstances require it to and is filled with a gooey substance.
- Peridot's Plug Robonoid led the Crystal Gems to Facet Five and the first confrontation between the Homeworld Gems and the Crystal Gems in thousands of years.
- Peridot's Escape Pod greatly resembles a Plug Robonoid.