not to get into the whole copyright argument, but technically I think anyone would easily categorize this as a parody and/or a satirical take on The Flash; and parody and satire are protected by "fair use."
"Creators of parody may be faced with questions of copyright infringement. In (a) 1994 decision, the Supreme Court held that a commercial parody may be a “fair use” in accordance with Section 107 of the Copyright Act, as a defense against an accusation of copyright infringement."
And anyway, I think the design is pretty funny. So whatever.
About my design