Sarah Manning witnessed someone who looks exactly like her jumped down the train tracks. Through a case of mistaken identity, she ended up pretending to be that person- a detective named Beth. This led her into finding out about the clone club- a group of people who look just like Beth and Sarah, because they are all clones! They were monitored by an evil company named Dyad and they were getting sick. So, Sara, along with the clone club, were on a mission to find out about themselves, and to take on Dyad.
Different secrets were revealed through the different seasons, more clones were introduced, and the story got more complicated. The main idea is that the clones shared the same DNA (genetic background), but due to the environment they grew up in (social influence), they have different personality, ambitions, vocation, intelligence, sexual orientation, etc. Genes might be the basis to who we are, but it isn’t everything.
Sarah Manning- our main protagonist. She is a rebel, British, and gives no f*ck about how the world views her. She is strong, loves her daughter, but also makes extremely bad decisions at times.
Felix- the flamboyant, British, gay adoptive brother of Sarah. He is funny, sarcastic. And he is an artist.
Cosima- the adorkable nerd scientist, Berkeley Ph.D. student, and the lesbian of the show. She is chill, intelligent, and a romantic at heart.
Delphine- the French scientist who realized she might be bi after meeting Cosima. She is intense at times. But she also is one of the few who cares about the clones. And her hair! It is like always perfect!
Tony—Oh Tony. He is a trans clone introduced in Season 2 then quickly rid of in the same season. He was there, but has no big role.
There is also Shay, but we don’t know enough about her.