The latest and the final downloadable (DLC) content for "Batman: Arkham Knight" Season Pass is now available and fans are delighted to finally have the most awaited update of the game.

Rockstead Studios' Guy Perkins took the announcement to PlayStation Blog on Tuesday. With "The Season of Infamy: Most Wanted Expansion," players have to deal with Batman's greatest enemies in four new missions and story arcs featuring Killer Croc, Ra's Al Ghul, The Mad Hatter, and Mr. Freeze.

The new missions include "Beneath the Surface," which features The Dark Knight on a mission to find out more about the flying airship prison called Iron Heights that holds Killer Croc captive. This prison crashed in the waters of Gotham City and unleashed an evil in the form of a mutant.

In "Shadow War," the events take place after "Batman: Arkham City" and the Caped Crusader deals with Ra's Al Ghul, who makes a comeback after he gets some help from the League of Assassins.

The "Wonderland" introduces the Mad Hatter who is determined to provoke Batman into playing "hallucinatory battle of wits," while Mr. Freeze returns to the city and deals with the problem of Nora's abduction. Nora was taken by the Militia and Freeze is determined to get her back even if it means capturing the Dark Knight.

Perkins, the brand manager for Rocksteady, not only announced the release of new story arcs and villains, but also other details of the DLC update.

The last Batmobile has been released and a 2008 Movie Batman Skin is also included, which Perkins highlighted to be a piece of content that is in demand.

While the "Season of Infamy" may be the last drop for the Season Pass, Perkins promised there's more to come for "Arkham Knight" fans.

"We've had a blast making the content, and we hope you enjoy battling some old foes on the streets of Gotham City. Don't fret; we still have the Community Challenge Pack hitting in January for your post-holiday Bat-fix."

As previously posted in Arkham Knight Forums, the Community Challenge Pack includes seven challenge maps from previous "Batman Arkham" games.