British comedian and "actor" Russell Brand has set his sights on what he views as the corruption in England's banking industry -- and the resulting income inequality -- in a new documentary titled The Emperor's New Clothes.

The trailer (above), released Friday, begins with a definition of The Emperor's New Clothes: "Collective ignorance of an obvious fact, or deception, despite undeniable evidence."

Brand's voiceover begins:

Inequality is getting greater. The rich are getting richer. Everyone else is struggling. Is that fair?

Then he continues complaining that despite a financial crash that was followed by bailouts, banking executives carry on doing what they do best -- "making more money."

"This is what we've come to expect as normal," Brand continues. "It doesn't have to be like this."

Brand, who is estimated to be worth $15 million, is using this documentary as "a mission to seek the men who killed our society." As seen in the trailer, he aims to make his point by driving through the city shouting on a bullhorn, and by ambushing bank lobbies with microphones and cameras, a tactic for which he is well known.

Another of Brand's complaints in the trailer centers around how far apart the incomes are for those who clean the windows at the bank and top-floor management. A similar gap he could have pointed to in his own Hollywood industry -- say a boom operator and a lead actor -- but didn't.

"A cleaner working in the city would have to work 300 years to make the same amount their boss would make in a year. People in the same office are living in different worlds," Brand's voiceover decries. "This is the institutionalization of greed."

The StudioCanal production is set for release April 21 and is to be followed by a live event from Brand himself. The film's social media campaign is tagged, #ThingsCanChange.