Publisher Warner Interactive has confirmed exactly what content is has locked behind the Online Pass included in new copies of Batman: Arkham City.
Inputting the code will grant access to the playable character Catwoman, who comes complete with her own moves, weapons and four additional story scenes.
She'll also be usable as a playable character in the Riddler's Revenge mode.
Those who buy a pre-owned version of the game can buy a separate Online Pass for either 800 Microsoft Points on Xbox Live or 7.99 on PSN, Eurogamer reports.
Warner adds that playing as Catwoman is not required to complete the main game.
Batman: Arkham City will be released in the UK on Friday October 21st.