After your introduction and thesis, you need to find and integrate a definition to work from concerning your superhero, supervillain, or anti-hero. Here is an example of a work up of the definitions of comics from Scott McCloud.
For you, it will be focused on locating and integrating a definition on a superhero or supervillain.
This may come from a Dictionary.
So, how do we cite that? Let me demonstrate:

This comes from Merriam-Webster.com:
https://www.merriam-webster.com/dictionary/superhero
Now, how do I cite this?
- Write out a citation for the Works Cited Page.
For this, there is no given author, but there is a title. Like with Wikipedia, or any other encyclopedia, a dictionary citation gets its title from the term you looked up, in this case: “superhero”
“Superhero.” Merriam-Webster.com. Merriam Webster. https://www.merriam-webster.com/dictionary/superhero. 24 June 2020.
Here I have the “title” and the website, plus the publisher, the URL, and Date of Access.
- Generate your in-text citation.