Brockwell Park was a park near Dulwich in south London.
In 2001, the Eighth Doctor fought a monster there which had emerged from the underground river Effra that surfaced in the park. (COMIC: The Fallen)
In 2015, the Twelfth Doctor went to the park's playground to talk with the leaders of Zygon High Command, who had taken the form of little girls, Jemima and Claudette. (TV: The Zygon Invasion)