Tenacity 2 CatRat
This is an alternate fan-version of the events, that could take place between the end of LABRAT comic and the start of Portal 2 game.
I've spent many hours researching, plotting and gaming Portal to make the story as true, believable and striking, as possible.
Rattmann's character is as mysterious as it can be, so I tried to solve a few mysteries here and there and close his story up.
The main focus is on his relationship with Chell and his own way how to survive and finally find a way out of the wrecked Aperture facility. When things don't seem to get any worse, Wheatley shows up to save the day.
Follow the journey of this unlikely duo and maybe you'll find something, that you long waited for.
DISCLAIMER: This is just one fan's view on the events. I am not claiming this to be the truth, so please, enjoy the story as a fellow Portal-fan, not a Mary-Sue