Summary

• Percy Jackson and the Olympians season 1 introduced seven Greek gods and one Titan, with more powerful beings expected in potential future seasons.
• Kronos, not technically a Greek god but the father of many Olympians, is the central antagonist of the series, as he is trying to start another war with the gods.
• Zeus, Poseidon, Hades, and their complicated relationships are explored, including Zeus and Poseidon breaking the agreement not to sire demigod children.

The family tree in Percy Jackson and the Olympians is rather convoluted, given all the Greek gods (and Titans) who make up the lengthy chart. The first season of the Disney+ fantasy television series featured various Greek gods that Percy Jackson, Annabeth Chase, and Grover Underwood encountered during (and after) their quest, and they are all related in one way or another. Some are siblings, others have a parent/child relationship, and a few are romantic. Whatever the case, the gods are complicated, and the reasoning behind their unhealthy relationships can partly be traced back to their family tree.

Ultimately, Percy Jackson and the Olympians season 1 introduced seven Greek gods (and one Titan). If Disney+ renews the show for more seasons, which seems inevitable because of its overwhelming popularity on social media, even more powerful beings will show up in future episodes. By the fifth season, which will likely be based on the last book in the Percy Jackson series, The Last Olympian, all the Greek gods will have appeared in one way or another (if the show continues being faithful to the source material).

Kronos

Although he technically isn't a Greek god, Kronos is the father of many Olympians in Percy Jackson and the Olympians. Kronos, the King of the Titans, is the central antagonist of the series, as he is trying to rise from the pits of Tartarus, where his son, Zeus, threw him after chopping him up into thousands of pieces eons ago. He wants to start another war with the Greek gods.

Aside from Zeus, Kronos is the father of Poseidon, Hades, Hestia, Hera, and Demeter and is Rhea's husband. Rhea also happens to be his sister, as both their parents are Ouranos and Gaea, and that's why the mighty beings in Percy Jackson are complex. So, it's best not to think about their relationships too hard.

Rhea

As mentioned above, Rhea is Kronos' wife and sister in Greek mythology and Percy Jackson and the Olympians. She is the Titan goddess of fertility, motherhood, and protection. Rhea is also Zeus, Poseidon, Hades, Hestia, Hera, and Demeter's mother, but unlike her husband, the Titan goddess was not cast away by her children. Although she doesn't appear in the book series, Rhea is still very much around and a part of her family's lives in Percy Jackson.

Zeus

Zeus, played by Lance Reddick, is the most powerful of the Greek gods (given that he is the King of Olympus and god of the sky) in Percy Jackson and the Olympians. His parents are Kronos and Rhea, while his siblings are Poseidon, Hades, Hestia, Hera, and Demeter. Hera is also Zeus' wife, but their relationship is fraught with tension and certainly not the healthiest marriage. Zeus' godly children include Ares, Hephaestus, Athena, Apollo, Artemis, Hermes, and Dionysus.

Given his pact with his brothers, Zeus doesn't have any demigod children in the show. Zeus, Poseidon, and Hades agreed not to sire any children following World War II because of the Oracle of Delphi's Great Prophecy and because their half-bloods were too powerful. Zeus broke the agreement when he had Thalia with a human named Meryl Grace, but his daughter died five years before the events of season 1. Following Thalia's death on Half-Blood Hill, Zeus turned her into a pine tree, which serves as the border of Camp Half-Blood.

Poseidon

Poseidon is arguably the most important Greek god in Percy Jackson and the Olympians, given that he is the main character's father. Percy's dad is the god of the sea, portrayed by Toby Stephens in the Disney+ series, and Percy is Poseidon's only son due to the Pact of the Big Three. Similar to his brother Zeus, Poseidon broke the agreement when he met Sally Jackson, and she later gave birth to Percy.

All eight episodes of Percy Jackson and the Olympians season 1 are available to stream on Disney+.

As mentioned above, Poseidon is the son of Kronos and Rhea. His siblings are Zeus, Hades, Hestia, Hera, and Demeter. While his brother Zeus is the Olympian in charge of Mount Olympus, Poseidon has plenty of power himself (and his own kingdom under the sea). Poseidon's rivalry with Zeus is infamous, as depicted in the Percy Jackson and the Olympians season 1 finale, but he is also known for his feud with his niece, Athena.

Hades

Hades, played by Jay Duplass, is the final member of the Big Three in Percy Jackson and the Olympians, given that Zeus and Poseidon are his brothers. The King of the Underworld and god of the dead's parents are Kronos and Rhea, while his other siblings include Hestia, Hera, and Demeter. Although she is not mentioned or seen in the show, Hades is married to Persephone, Demeter's daughter. Additionally, Hades has no children in season 1, so he is the only one of his brothers not to break the Pact of the Big Three.

Hera

Hera is one of the Olympians not featured in season 1 of the Disney+ fantasy series, but if there are more seasons, she will undoubtedly make her presence known soon enough. Hera is the daughter of Kronos and Rhea, the sister of Zeus, Poseidon, Hades, Hestia, and Demeter, and the wife of Zeus. Since she is Zeus' wife, Hera is the Queen of Olympus, but she is also the goddess of marriage, meaning that she doesn't cheat on her husband or have children with mortals (and why Zeus' infidelities anger her). But with Zeus, Hera had Ares and Hephaestus.

Demeter

Demeter is the goddess of the harvest in Percy Jackson and the Olympians, but she is not seen in the first season. The Greek goddess is the daughter of Kronos and Rhea and the sister of Zeus, Poseidon, Hades, Hestia, and Hera. Demeter had an affair with Zeus, and together, they had Persephone, who would later be trapped in a marriage with Hades, much to her mother's dismay. Although Demeter has a seat on Olympus, she doesn't have a significant presence in the story (at least, in the book series).

Hestia

Although it may not seem like it after Percy Jackson and the Olympians season 1, Hestia plays an important role in Rick Riordan's series. Hestia, the Greek goddess of the hearth, is Kronos and Rhea's daughter, and Zeus, Poseidon, Hades, Hera, and Demeter's sister. Hestia is a virgin goddess, so she never had any children and, therefore, hasn't claimed any demigods at Camp Half-Blood. She also doesn't have a throne on Olympus and instead tends to the sacred hearth in the throne room, which can be seen in episode 8.

Athena

Athena didn't appear in Percy Jackson and the Olympians season 1. But she still made her presence known in episode 4. Athena, the goddess of wisdom, is the daughter of Zeus, and to make a long story short, she burst out of her father's head fully grown and wearing battle armor. Consequentially, Athena's demigod children are born the same way — as thoughts of the goddess — but they still have human fathers. Annabeth Chase is one of many of Athena's children at Camp Half-Blood, and her mother's feud with Poseidon makes her relationship with Percy a bit complicated.

Ares

Ares, portrayed by Adam Copeland, is one of the most prominent Greek gods in Percy Jackson and the Olympians season 1. He is the god of war and is manipulated by his grandfather, Kronos, into helping with the plan to start a war between Zeus and Poseidon. Ares is the son of Zeus and Hera and brother of Hephaestus. Although his brother is married to Aphrodite, Ares has carried on an affair with her for years. Ares has many children at Camp Half-Blood, but Clarisse La Rue is the most important of them all, given her feud with Percy.