Hello VermiciousKnid,
First of all, Batman and Superman are both definitely copyrighted characters. Can you use them briefly? Probably -- the entire point of copyright law is to prevent from stealing the creations of others and profiting from them. The entire point of trademark law is to prevent you from creating a similar product and tricking the buyer into thinking that your product and the original product are the same thing.
Limited use of copyrighted materials is allowed as what the courts call "fair use." A brief sample for the purposes of reviewing the work is an example of fair use. Satire and parody are also considered fair use. If your appearance of Batman occurs for the purpose of poking fun at something (like poking fun at Batman), that would be fair use. There have been some cases in which intellectual property owners have challenged fair use in court, but those cases were quite extreme, like copying an entire song and selling an almost identical version but calling it a parody.
Did that clear things up, or did I make it more confusing?
I won't be promoting your work on my page about Public Domain Characters if you aren't using any public domain characters, but what you are doing seems okay based on what you wrote, VermiciousKnid.
Some quick examples...
Copyrighted character: Mickey Mouse
Public Domain character: Santa Claus
Copyrighted character: Batman
Public Domain character: Tarzan
Copyrighted character: Marvel's Daredevil
Public Domain character: the golden age Daredevil