Prototype font here refers to the font used in the logo of Prototype, which is an action-adventure open world video game developed by Radical Entertainment and published by Activision.
The Prototype logo was probably designed based on Helvetica Black, adding some grunge effects. Helvetica Black is available as a commercial font and more details about it can be found here.
Download Helvetica Font
The Helvetica font identified above is not available for free, please follow the link above and purchase the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.