Roaming Eye

The Roaming Eye is a massive meteor-like Homeworld tracking spacecraft which first appears in "Barn Mates". It was used by five Ruby soldiers who were searching for Jasper, before being stolen by the Crystal Gems during the events of Back to the Moon and Bubbled.

Appearance
The Roaming Eye is a red and spherical-shaped device similar to the Red Eye. The center of the ship has a yellow triangular indent where eyes are located. Originally there is only one yellow hexagonal eye from the center, but when the ship locates Steven, Peridot and Lapis, four more eyes appear, which could be the Rubies inside looking. When the Roaming Eye is beginning to launch an attack, the yellow center turns from yellow to red. At the bottom of the Roaming Eye are three spikes protruding from the ship; two in the center and one in the back, most likely used as landing gear. The top of the ship has a hatch for entering and exiting the ship. When the Roaming Eye is taking off, the spherical shape deforms and becomes elongated as well as a black sphere levitates above the ship.

Abilities
By using some sort of anti-gravity drive, it has the ability to defy Earth's gravitational pull, freely levitating over the surface. From the center of the ship, the Roaming Eye can emit light for spotting targets. While it is not shown, it is implied that the Roaming Eye has some sort of offensive maneuver.

The Roaming Eye has a scanner, used to scan and lock onto Gems. The Roaming Eye also possesses an ability to transport from one place to another in an unimaginable way. Due to the modern age in Homeworld, the Roaming Eye can use a stable "black hole"-like matter and stretch to the specified planet they seek to explore with less to no friction needed.

"Barn Mates"
The Roaming Eye chases Peridot, Lapis and Steven into the barn. It emits a light into the barn which causes the three to flee back outside in panic. When the Roaming Eye clearly sees the three targets, the screen in the center turns red. However, Lapis easily crashes it into the ground with a water hand. After crashing, a white diamond shape is branded into the ground. The hatch on the top opens up and a Ruby climbs out.

"Hit the Diamond"
Five Ruby soldiers climb out of the device. During the baseball game, the Roaming Eye is used as a pitcher's mound. At the end of the game, when the Rubies lose, they climb back into the device and leave to Neptune where they believe Jasper is.

"Earthlings"
The Roaming Eye is briefly seen in the background at the end of the episode when Lapis has contained the Ruby soldiers in separate water bubbles.

"Back to the Moon"
The Roaming Eye plays a big part in this episode, since they used it to travel to the diamond base located on the moon. In addition to seeing the outside of the ship, the inside and its controls are also seen. While it looks small from the outside, it is actually quite large inside. It's able to easily fit all 5 rubies and all 4 Crystal Gems (including Amethyst who shape shifted herself into a larger form while imitating Jasper). The Roaming Eye is currently left behind on the moon base, since the rubies flew out of the door when Steven opened the air lock.

"Bubbled"
The Roaming Eye is commandeered by the Crystal Gems to locate Steven in the depths of space and used by The Crystal Gems to go back to Earth.

Trivia

 * The Roaming Eye is similar to the Red Eye; both round ships sent to Earth to attempt to locate Gems.
 * The concept of this ship being bigger on the inside may be a reference to the TARDIS from the popular sci-fi series "Doctor Who", as both are spaceships which are larger on the inside than they appear to be from the outside.
 * The Roaming Eye is the second Homeworld vessel to be commandeered by the Crystal Gems, the first being the Gem Warship. Unlike the Gem Warship, however, the Roaming Eye wasn't destroyed and remains in their possession.

"Hit The Diamond"
Ojo Explorador