Sunday brought the arrival of a new trailer for "#Ready Player One." It also brought a ton of Easter eggs for video game fans and cultural buffs alike. Anyone who blinked in the trailer probably missed at least one of these essential details. There was one in particular that seemed important. After all, there were tons and tons of video game characters that only gamers would likely recognize. A character from the Batman universe, however? That has a much more universal appeal.

Important trailer details

By far, the most well-known characters to appear in the trailer were legendary DC villains #harley quinn and #The Joker.

Those two have seemingly been everywhere lately, from the "Suicide Squad" movie to the "Gotham" television series and video games galore. They are iconic characters that the public is generally obsessed with. Having them in "Ready Player One" will help to develop a larger audience for the niche film.

They were far from the only characters to make an appearance in Sunday's trailer. The terrifying Chucky pops up. So do Chun-Li from "Street Fighter" and Tracer from "Overwatch." So is a character from "Mobile Suit Gundam," which is as obscure as it sounds. Even King Kong appears. In many ways, it feels like the live-action version of "Wreck-It Ralph." Nevertheless, it's a smart way for "Ready Player One" to appeal to mass audience.

More on "Ready Player One"

Under the directorial guidance of Steven Spielberg, "Ready Player One" is being adapted for the big screen in 2018. Tye Sheridan is set to star, with T.J. Miller and Simon Pegg among the other main cast members. It's based on Ernest Cline's 2011 novel of the same name. Warner Bros. Pictures is distributing the film. The release date is just over three months away: March 30, 2018.

In 2045, the world is the dark, desolate place so many believed it could become. To escape that world, people engage in a world of virtual reality.

Within that world, there is a competition where the winner owns the entire virtual reality world. Throughout the world, there are tons of references to cultural characters and elements from the 1980s through the early-2000s. Those references include "The Iron Giant," "Back to the Future," and "Knight Rider," among others.

"Ready Player One" is bound to be a thrill ride for moviegoers and video game lovers alike. It should come as no surprise that Harley Quinn and The Joker would want in on that fun.