Zeus, King of the Gods, God of Thunder (Nicola Ryan)

Zeus is the King of the Gods, and knows it.  He is charismatic, charming, self assured and a little bit of a jerk.  He is a strong leader, but is somewhat lacking in the planning and foresight departments.  He tends to always do things on the fly.  As a god, this general strategy had never failed him, so it is trying for him when he discovers that "winging-it" doesn't always succeed for mortals.  Zeus appears in all episodes, and is featured in 1, 2, and 5.

Hestia, Goddess of the Hearth (Alexandra Schultz)
Hestia is non-confrontational and very warm-hearted.  She loves her friends, but also wants to be loved by them.  It is this desire to be included that first motivates her to descend from Mt. Olympus, leaving the Sacred Flame unguarded.  When the Flame goes out and her friends blame her (directly or indirectly), she takes it very hard.  She is featured in episodes 1, 3, and 5.

Poseidon, God of the Sea and Earthquakes (David Litt)
Of all the gods, Poseidon takes his job the most seriously; he is organized, hardworking, and loyal.  However, he also has very high standards for others, which can make him seem anal and disagreeable.  He has a lot of tension bottled up inside him.  Poseidon appears in most episodes, and is featured in 1, 2, and 5.

Athena, Goddess of Wisdom, Strategy, and Justice (Madeleine Heil)
Athena is the wisest of the gods.  She is, for example, the only one who attends classes, which is how she meets Prometheus.  She is the god who most fully ponders the implications of their loss of power.  Through her, the TV series addresses many of the more philosophical questions.  Athena appears in all episodes, and is featured in 1, 2, and 5.

Prometheus, a Titan, champion of humankind (Steve Kidd)
The Titan Prometheus is currently spending his time as "Professor Julian," teaching Greek mythology, and leading a hand-picked group of bright students in readings in philosophy and political science.  He is a thoughtful man with a deep seated commitment to intellectual advancement and the service of humankind.  Yet, there may be more to him than meets the eye.

Ares, God of War, Bloodlust, or Slaughter Personified (Harry Mickalide)
Even when he's powerless, Ares' presence makes people slightly more on edge.  He is arrogant, antagonistic and short-tempered.  However, his character develops and finds unexpected vulnerability when he falls in love in episode 4.  He appears in most episodes, and is featured in 1, 4 and maybe 3.

Hades, God of the Underworld (Harry Aspinwall)
Hades is dark in demeanor, but approaches the world with a certain subdued but genuine curiosity.  As he gets to know the outside world, he begins to take a quiet pleasure in things like sunshine and cookies.  Since he has spent most of his time without living company, he is not particularly comfortable in large social settings.  If, when he speaks, he says something that is awkwardly morbid, it is not because he means ill, but rather because this is the subject that is most familiar to him.  He is quiet, but speaks volumes with his eyes.  Hades appears for the first time in episode 3, which features him.

Aphrodite, Goddess of Love, Beauty and Raw Sexuality (Sarah Lewis)
Aphrodite will willingly inform anyone of the fact that she can "read" people and understand the complex dynamics of the human heart.  She is, however, wrong.  Once she is no longer a god, rejection after rejection start to undermine her self-esteem.  However, through Ares' unexpected romantic interests in episode 4, she is able to see a new aspect of Love, and reconcile herself with her husband Hephaestus.  Aphrodite is featured in Episode 4.

Hermes, Messenger of the Gods (Paul Meier)
Hermes is quick enough, in mind as on foot, that he has to amuse himself to keep from being bored.  Perhaps he takes the whole "powerless" situation seriously, but not to such an extent that he would pass up a chance to make the perfect one-liner.  He is pretty proud of himself.  And rightfully so, dammit; he's a funny guy.  Hermes appears frequently through the series as a comedic foil.

Hephaestus, God of Technology, Blacksmiths, and Volcanoes (Leandro Zaneti)
Hephaestus is a genuinely sincere and kind individual, and is rather in love with his wife, Aphrodite.  However, because he is unassertive and awkward (and lame), Aphrodite generally ignores him, which saddens and frustrates him.  He is loyal and warm hearted, but resolute in his decisions.  Hephaestus is featured in episode 4, and appears in other episodes.

Apollo, God of the Sun, Music, Poetry, and the Arts (Ben Jones)
Apollo is an easy-going musician.  He likes attention.  Apollo is featured in episode 1, and has a small part in later episodes.

Artemis, Goddess of Forests, Virginity, and the Hunt (Elsia Obus)
Artemis is a bottle of energy.  She is caring and well tuned-in to the emotions of others.  However, she'd really rather not get involved in all these emotional relatio(nship-y things herself.  Hucking rocks at trees is far more fun.  Artemis appears sparsely in the series.

Hera, Queen of the Gods, Goddess of Women and Marriage (Olivia Harding)
Hera has the privileged ability to let Zeus know when he's being stupid.  Hera appears sparsely in the series.

Sam (Christopher Fitzsimmons)
Sam belongs to a college fraternity, but seems to possess more common sense, and even intelligence, than one normally associates with this species.  He is good-natured and very athletic.  One might call him the pinnacle of masculinity. He appears in episode 1, and is featured in episode 4 as Ares' love interest.

Landlord (Rob Jarbadan)
The Landlord always seems to pop up, uninvited, at the most inopportune times.  From some mysterious lease, he produces lists of nitpicking and frequently absurd rules.  The Olympians quickly discover that most people who are not gods sometimes actually have to do what other people tell them to.

Smaller Speaking Roles
Teaching Assistant, Party attendees, Students, Frat Members, Sorority Girls, Toga guys, Book Reading club members, Apollo's Band ("Muse About")