Cave Johnson's only full appearance to date is in the 2011 video game
Portal 2, having been referenced in an
Easter Egg in the first
Portal game in 2007. Johnson's voice actor,
J.K. Simmons, spoke original lines for various trailers for
Portal 2, including at the
PAX East exposition in 2011. Cave Johnson does not appear directly in
Portal 2, but his image is seen in paintings and his voice is heard in pre-recorded messages as protagonist
Chell traverses abandoned parts of the
Aperture Science facility. These messages explain various areas, as well as the backstory of the company. In these pre-recorded messages, he is sometimes accompanied by his assistant, Caroline. Over time, both the company and his health begin to decline, the latter due to exposure to
moon rocks. He later muses on the prospect of
putting a person's mind inside of a computer, before saying that if he doesn't live until he can be uploaded, to put Caroline in charge of the facility as an AI, revealing that Caroline is
GLaDOS. An alternative version of Cave Johnson appears in the
Portal 2 update, Perpetual Testing Initiative. J.K. Simmons returned to the role for
Lego Dimensions, and is able to be heard throughout the
Portal 2 adventure world and bonus level. In his
Lego Dimensions appearance, Cave Johnson has put his own consciousness in a Personality Core. He also portrays Cave Johnson in
Dota 2, where Cave was added as an in-game guest announcer. In 2022, Simmons once again reprised his role as Cave Johnson for the
Steam Deck tech demo
Aperture Desk Job. The game takes place some years after Cave's body has died, but his personality has been implanted in a giant computer encased in a stone carving of his own head. ==Reception==