Dr. Felix Hoenikker is a fictional character from Kurt Vonnegut's novel, *Cat's Cradle*. He is portrayed as a brilliant but socially inept scientist who played a crucial role in the development of the atomic bomb during the Manhattan Project. His character embodies the complexities of scientific innovation and its ethical implications. In the story, Dr. Hoenikker is also known for creating a substance called ice-nine, which has the potential to freeze water instantly. This invention serves as a central plot device, illustrating the unintended consequences of scientific discovery and the responsibility of scientists in society.