Brian Flagg was portrayed by Kevin Dillon in the movie The Blob.
He is one of the protagonists of the 1988 remake of the Blob. He is seen as a Rowdy by the others. He discovers The Can Man, when he was attacked by The Blob. He carries him to the hospital with the help of Megan Penny and her boyfriend Paul Taylor. Megan reports later what happened to him and her boyfriend. He, together with Megan, investigate the appearance of The Blob while protecting themselves from it and helplessly seeing it killing townspeople.
They both discover the armed government unit and report what happened. Realizing that something is wrong, he escapes, discovers the truth regarding the government appearance and the government conspiracy to catch the Blob, which turns out to be a product of a bio-weapons experiment in space the government intends to catch sacrificing the town on the way in the name of the Cold War.
He saves Megan, destroys the conspiracy and stops the Blob with her help.