The plot had humans from a different system that suffered a catastrophic event on their home world, if I remember correctly.
It was implied that their ancestors seeded life in other planets too (or just separated themselves into 4 or 5 different planets?) or something like that, so they leave their system to find if their mythology has any truth. During the last episode they find their cousins... our Earth
It wasn't something very popular I guess but it was a decent production.