You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Doctor_Who

Context:
Doctor Who follows the adventures of the primary character, a rogue Time Lord from the planet Gallifrey, who simply goes by the name "The Doctor". He fled from Gallifrey in a stolen Mark I Type 40 TARDIS – "Time and Relative Dimension in Space" – time machine which allows him to travel across time and space. The TARDIS has a "chameleon circuit" which normally allows the machine to take on the appearance of local objects as a disguise. However, the Doctor's TARDIS remains fixed as a blue British Police box due to a malfunction in the chameleon circuit.

Question:
What planet is Doctor Who from?

Gallifrey