Earlier this week, the first in a series of character posters from the highly-anticipated action-packed sequel Avengers: Age of Ultron debuted, straight from the Twitter pages of stars Robert Downey Jr. (Iron Man) and Mark Ruffalo (Hulk). Today, Samuel L. Jackson debuted two more one-sheets for his character Nick Fury and Scarlett Johansson's Black Widow from his own Twitter page. With a cast that's larger than ever, there may be no end in sight to these poster reveals for this Marvel Phase Two sequel.

As in the previous one-sheets, both Nick Fury and Black Widow are seen in the midst of battle, with several of Ultron's (James Spader) robotic soldiers looming in the background. In Avengers: Age of Ultron, Tony Stark attempts to jumpstart a dormant peacekeeping program. Things soon go awry and Earth's Mightiest Heroes, including Iron Man, Captain America, Thor, The Incredible Hulk, Black Widow and Hawkeye, are put to the ultimate test as the fate of the planet hangs in the balance. As the villainous Ultron emerges, it is up to The Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure.

The only Avengers who have yet to debut character posters are Chris Hemsworth's Thor, Chris Evans' Captain America and Jeremy Renner's Hawkeye, but we'll also likely see one-sheets from new additions Aaron Taylor-Johnson (Quicksilver), Elizabeth Olsen (Scarlet Witch), Ultron himself and possibly Vision (Paul Bettany). Which character poster would you like to see debut next? Take a look at Nick Fury and Black Widow's one-sheets then chime in with your thoughts below.

<strong><em>Avengers: Age of Ultron</em></strong> Nick Fury Character Poster
<strong><em>Avengers: Age of Ultron</em></strong> Black Widow Character Poster