The baby, also known as the Metroid Hatchling, Metroid Larva, Hatchling or infant Metroid, is best remembered in its Infant Metroid stage from Metroid II: Return of Samus and Super Metroid, though it did not remain in that form. Samus Aran was ordered by the Galactic Federation to exterminate the remaining Metroids on SR388, so they could no longer be used as weapons by the Space Pirates. She encountered several stages of the creatures on her mission, eventually defeating the Queen Metroid. Soon after, she came across a Metroid Egg, the last remaining of the species. It hatched as she approached, and as she was the first thing that it 'saw', the Metroid imprinted Samus as its unwitting adoptive mother.
James Pierce was one of Adam Malkovich's 07th Platoon Marines in Metroid: Other M. James is the team's Communications Expert and has a scar above his left eye. Adam orders him to investigate the Control Bridge. When the group reaches the BOTTLE SHIP Control Room and encounters a Brug underneath a deceased Lab Worker, Lyle Smithsonian kicks it and shoots it until James instructs him to stop.
The Doomseye is a Space Pirate battleship and their "strategic weapon" in the Bermuda System operation. Under the control of Master Brain, it is the main antagonist of Metroid Prime: Federation Force and the final location. The Pirates seek to use Doomseye to take their revenge against the Galactic Federation after their organization was weakened following Metroid Prime 3: Corruption.
The Gravity Suit is an upgrade for Samus Aran's Power Suit. As its name implies, the Gravity Suit is known for negating gravitational effects such as zero gravity in space. The Gravity Suit enhancement is obtained after the Varia Suit; the addition turns sections of Samus's armor purple, reduces the damage she takes (to a greater extent than the Varia alone), and allows her to move in fluid unhindered by the resistance and pressure it would normally exert.
Thardus is an enormous rock monster charged with Phazon energy that inhabited Tallon IV in the Phendrana Drifts. It was originally an experiment by the Space Pirates to use Phazon to create sentient creatures out of inanimate objects, but was found quarantined in a cavern in Metroid Prime. This experiment was titled "Project Titan".
The Phazon Enhancement Device Suit is a Phazon Enhancement Device designed for Samus Aran. After Dark Samus corrupted her, Ghor, Rundas, and Gandrayda, their bodies began producing Phazon. The Galactic Federation rebuilt Samus' suit with their PED technology so that she may safely harness Phazon.
Dr. Madeline Bergman was the Site Manager and Development Director of the BOTTLE SHIP's secret projects in Metroid: Other M. She was also responsible for the creation and eventual malfunction of MB (who posed as Madeline to Samus), leading to her sending the Baby's Cry distress signal. This distress signal caught the attention of Samus Aran and the 07th Platoon, leading to the events of the game.
The Berserker Lord is a boss in Metroid Prime 3: Corruption. It is the first boss that Samus Aran faces in the game, on the G.F.S. Olympus. Another is faced later into the game on Eastern SkyTown, Elysia. The Lords are very similar to the Elite Pirate and Ingsmashers, playing the same role in terms of gameplay. A Berserker Lord is a Berserker Knight that has survived further corruption with more Phazon than what Knights can usually tolerate (similar to the Omega Pirate compared to Elite Pirates). It is possible the Berserker Pirates are the result of improved experimentation following Project Helix.
Metroid: Samus Returns is an action-adventure game announced during the Treehouse broadcast on June 13, 2017. It is a 2.5D remake of Metroid II: Return of Samus, and the first traditional Metroid game since Metroid: Zero Mission (also a remake) in 2004. The game features graphics and melee combat similar to Metroid: Other M. Yoshio Sakamoto is leading the game's development, and has stated that it began development in 2015. Samus Returns is being developed by MercurySteam, who were previously working on a Metroid pitch that was presumably rejected.
A Queen Metroid is the largest and most powerful Metroid in the species' standard strain. She is the only individual naturally capable of laying Metroid Eggs, making her solely responsible for the reproduction of the entire species. Only two Queens have been encountered in the chronology of the Metroid series. The first was the main antagonist and final boss of Metroid II: Return of Samus and its remake, Metroid: Samus Returns. The second Queen, cloned from the previous one's last offspring, appeared near the end of Metroid: Other M, battled by Samus as one of the final bosses.
Gulluggs are flying creatures that Samus encounters throughout the planet SR388. While they are somewhat docile in Metroid II: Return of Samus, they are extremely aggressive in Samus Returns. They patrol a set location and in the latter game will lunge towards Samus with their sharp, elongated mouth parts. Gulluggs are the first enemy that Samus is properly introduced to the Melee Counter with and ironically gain a stronger variant immune to the counter, while also being the most common creatures encountered in the caverns.
Sheegoth are large predatory creatures native to the frigid Phendrana Drifts region of Tallon IV. Samus Aran faced many Sheegoths while exploring Phendrana on her mission to Tallon IV. Four Baby Sheegoths and a very large adult guarded the Wave Beam in the Chapel of the Elders there.