A contest got the designers of Mr. Jack 137 ideas for new characters. Out of those 137 two were chosen:
The expansion contains these 2 new characters and 3 others designed by Bruno Cathala and Ludovic Maublanc:
Captain America - $16.99
Scarlet Witch - $16.99
Nebula Hero Pack - $16.99
Nova - $16.99
Storm - $16.99
Gambit - $16.99
Marvel Champions Hero Pack
Varies
Green Goblin - $21.99
The Once and Future Kang Scenario Pack - $21.99
The Hood - $21.99
MojoMania - $21.99
Marvel Scenario Pack
Varies