Table:
text: The Official Marvel Graphic Novel Collection
Marvel's Mightiest Heroes
List of books
Issue Volume Title Main_Feature_Story First_Early_Appearance_Story_Stories Release_Date_
5 10 The Hulk Dogs Of War (The Incredible Hulk volume 2 #12-20) None 26 Feb 2014
6 22 Jean Grey Here Comes Yesterday (All-New X-Men #1-5) X-Men Origins: Jean Grey 12 Mar 2014
7 49 Power Man Power Man and Iron Fist #50-53 Luke Cage #1-3 26 Mar 2014
8 TBC Captain America Captain America #247-255 ? 9 Apr 2014
9 TBC Iron Man The Five Nightmares (Iron Man (Vol. 5) #1-7) Tales of Suspense #39 23 Apr 2014
10 TBC The X-Men X-Men: Children of the Atom #1-6 X-Men (Vol. 1) #1 7 May 2014
11 TBC Black Widow TBC TBC 21 May 2014

Question: What was the name of the next release after Iron Man in the Official Marvel Graphic Novel Collection?