Available on iOS and Android devices, the first instalment of Avengers Initiative will go on sale tomorrow for $6.99. Set in the same universe as Facebook's Marvel: Avengers Alliance, the first episode picks up after "The Pulse" results in America being left without power, with Nick Fury tasking Earth's Mightiest Heroes to keep a country in chaos under control. Written by Fred Van Lente (Amazing Spider-Man), the first instalment sees the Hulk battle some of his most iconic villains - and other well-known Marvel bad guys - in 'The Vault'. Future episodes (released for no extra charge) will put the spotlight on other Avengers such as Captain America, Iron Man and Thor. For more details on gameplay and what role "Marvel Xp" will play in the title, click on the link below.