Agrippina Primus

Agrippina Primus was the capital city of the colony world Agrippina.

After the Eleventh Cyber Legion had taken over the planet and moved on to other worlds, a resistance based in Agrippina Primus attempted to destroy the Cyberman hive mind dominating their planet. To accomplish this, they reprogrammed Cyber-units enough for them to gain their sentience, calling them Doubts, so they could connect to the cybermites and disrupt the hive.

When the Fifth Doctor heard of what he had befallen Agrippina, he came to help rebuild only to discover the resistance's actions. Confronting them in a church, he made Doubt realise what she truly was, his words inspiring her to reprogram the hive to planet crocuses and heal the blighted world. (PROSE: A Girl Called Doubt)

In an alternate timeline, the Doctor died in Agrippina Primus. As his TARDIS grieved, a billion cybermites targeted her for cyber-conversion. Deactivating her chameleon circuit, the TARDIS swelled to planetary size, her self-repair systems subsequently engaging in a duel with the Cyberman code. (PROSE: The Paradox Moon)