O
- Obsidian
- A volcanic planet where Avon had hoped to set up a secret base of operations for the resistance. Servalan sets up a trap in an attempt to ambush the Liberator crew and take over the ship.
- Overon
- One of the neutral worlds considered as an option to take Gan for medical treatment when his limiter implant malfunctioned, but ruled out on the grounds that they had "third level" technology. At the time, the world was 350 hours from the Liberator's position.'
Read more about this topic: List Of Blake's 7 Planets