Captain America as portrayed by Chris Evans in Marvel's 'The Avengers.' Photo courtesy Disney/Marvel.
CLEVELAND -- Marvel tried to keep the presence of their film's titular villain a secret -- but his arrival on set of "Captain America: Winter Soldier" late Thursday created web buzz so intense that no superhero could stop it.
The moment came as crews were filming another action sequence, this time near Cleveland State University. Shortly after 2 p.m., pictures began popping up on social media from sources like @Daily_Superhero on Twitter showcasing the first glimpse of the Winter Soldier himself.
With his partial facemask, kneepads and dark-colored sleek jacket, the Winter Soldier was spotted in the street holding a strange, black firearm.
Photos: "Captain America: Winter Soldier" films in Cleveland
Nearby, a production assistant was seen holding a handwritten sign telling those watching from a distance that no photos were permitted
That request was ignored as dozens of photos quickly appeared online because it was the first time a major character other than Samuel L. Jackon's Nick Fury was seen in town.
Sebastian Stan fills the role of the Winter Soldier -- aka Bucky Barnes.
Video: Cleveland's rich film history
WKYC has heard from numerous reliable resources that both Chris Evans (Captain America) and Scarlett Johansson are in town, but neither have been spotted. Evans, who is a regular tweeter, has been invisible from Twitter since a May 15 post he unleashed from the film's set in Washington D.C.
"Captain America: Winter Soldier" -- which is slated for release April 4, 2014 -- is moving its production to the West Shoreway where crews closed down several miles of the heavily traveled roadway for two weeks on Friday. Rumors indicate this will be the site of a high-speed, action-packed chase sequence.
Other unconfirmed reports indicate crews have been lensing scenes in the dam area of Lake View Cemetery.