Villengard

Villengard was a planet located at the centre of the universe. Its weapons factories were known as the "Nightmare of the Seven Galaxies". (TV: Twice Upon a Time) Sonic blasters were produced there in the 51st century. (TV: The Doctor Dances) It had a moon in its orbit, though by the time the First and Twelfth Doctors alongside Archibald Hamish Lethbridge-Stewart and the glass avatar of Bill Potts visited, it had been partially destroyed. (TV: Twice Upon a Time)

The Doctor, in his ninth incarnation or earlier, once visited the weapons factories and caused the reactor to go critical, vapourising them. Afterwards, a banana grove grew there, which the Doctor used as a justification for his actions to Jack Harkness (along with swapping Jack's sonic blaster with a banana that had been grown in said grove). (TV: The Doctor Dances)

When the Eleventh Doctor set a test to verify Amy's identity so that she could unlock his message a thousand years later, one of the possible questions was 'Where are sonic blasters made?'. The correct answer was Villengard. (GAME: TARDIS)

Eventually, the "good" Dalek Rusty came to the ruins of Villengard's weapons factories, where he set himself up inside a tower to fight off other Daleks seeking to destroy him. The ruins became infested with Kaled mutants without their casings. The Twelfth Doctor visited Rusty to access the Pathweb and learn the identity of Testimony's glass avatar. (TV: Twice Upon a Time)

The Thirteenth Doctor had a conversation with the Moment in Villengard's banana groves. (PROSE: The Day of the Doctor)

Villengard