Dido

Dido was the home planet of the natives of Dido. It had been visited by the First Doctor twice, though no details exist as to his first visit. Dido was home to telepathic Near-human Didonians and formidable-looking (though apparently harmless) creatures known as Sand Beasts.

In 2493, a human spacecraft crash-landed on the planet. The only survivors of the wreck were Vicki and Bennett, a murderer who killed the other survivors and the natives of Dido, apart from two who survived. The First Doctor and his companions arrived on Dido in the TARDIS. They discovered the truth behind Bennett and two surviving Dido natives killed him. The travellers then took Vicki away in the TARDIS with them. (DW: The Rescue)

The planet was protected under the Galactic Heritage. (EDA: The Tomorrow Windows)