Well, if 'Based on a True Story' is a project in the entertainment field, Brandon Keener could be one of the many elements contributing to it. He could be an artist involved in the creation, perhaps an actor who brings a particular character to life. But again, without more details about this 'true story' - based project, it's difficult to give a more in - depth account of who he is in relation to it.
I'm not sure specifically what a 'catherine cell' is in this context as the term is rather unclear. It could be a very specific or made - up concept within that particular story.
The significance of Brandon Keener in 'Based on a True Story' is unknown without additional information. He could be important for the plot, but we need more details to tell.
Harley Keener does not become Iron Man in the comic universe. The storylines and character developments don't lead in that direction. He might have his own unique adventures and contributions within the comic world, but not as Iron Man.
In the 'the black widow the catherine nevin story', Catherine Nevin was probably a person who had actions or a reputation that earned her the 'black widow' title. This could mean she was involved in activities that were not above board. It could be related to financial misdeeds, or actions that took advantage of people's vulnerabilities. Maybe she was at the center of a scandal or a criminal case where her actions were so notable that she became known as the 'black widow' in this particular story.