Read the text and determine if the sentence is true:

The Invisible Woman (Susan "Sue" Storm-Richards), previously known as the Invisible Girl, is a fictional superheroine appearing in American comic books published by Marvel Comics. The character is a founding member of the Fantastic Four and was the first female superhero created by Marvel during the Silver Age of Comics.

Sentence: The Invisible Woman is the only female in the Fantastic Four.
It's impossible to say