Replacing Super Time Force, Xbox One Gold Members will be able to download Chariot, a new ID@xbox game. It will remain free for the entire month of October.
On Xbox 360, starting Wednesday, October 1st, Battlefield: Bad Company 2 (normally US $19.99) will be free for Xbox Live Gold members through October 15th.
Then on October 16th, Xbox Live Gold Members can download Darksiders II (normally US $49.99) for free through October 31st.