Lethe (The Juggernauts)

Lethe was a fringe planet in the Beta Orianus system, with a methane-rich atmosphere and prone to very strong wind gusts of up to 200 miles per hour.

Lethe was home to a domed mining colony owned by the Outreach Corporation, where water was rationed and the colonists had subcutaneous implants to monitor their movement and well-being. The Imperial Daleks could survive in the planet's atmosphere. (AUDIO: The Juggernauts)

During the journey from Necros to Skaro, (TV: Revelation of the Daleks) the Renegade Dalek ship carrying Davros crashed on Lethe, and Davros began masquerading as "Professor Vaso." He developed Mechanoids into "Juggernauts" using organic material cannibalised from human victims, being unwittingly assisted by Melanie Bush who was stuck waiting for the Sixth Doctor. (AUDIO: The Juggernauts)

Lethe (The Juggernauts)