Space Core and Rick Core are first seen when Ratman reveals that he replaced his testicles with them, following the senior graduation party, when Cave Jonson exploded them. Their origin is unknown, as they predate Portal Labs, but it is known that Ratman retained them while in Portal Labs and while being thrown to space. Space Core is still convinced he is in space, while Rick is mad at the development.
Since Space Core has the power to breathe in space, similar to Marrissa Roberts, Ratman was able to survive in space and return to the Earth.
Fact Core only appears in MarissaxChell, as he and Wheatly were in a romance, making Marissa distraught.
- ASBusinessMagnet named the members of the Snow family, Morality Snow and President Curiosity Snow, after two cores that appear in the first Portal game.
- ITS MY LIFE! (First appearance) (Space Core, Rick Core)
- TEEN FORTRESS 2 (Space Core, Rick Core)
- MarissaxChell (Fact Core)
- Portal: The 4th Millennium: The Trollfic Edition (Space Core, Rick Core)
- THE MARRISSA GAMES (Space Core, Rick Core)