Jonathan Ishii

Jonathan Ishii is a character in Doom 3. A scientist within the Delta Science Team, he disappears shortly before the demon invasion. The first assignment within the game is to find Ishii. Sergeant Kelly dispatches the player, following reports that Ishii was spotted in the Mars City underground approaching the airlock that leads to the old communications array.

Upon finding Ishii, the scientists panics and begs the player to let him send a transmission to Earth warning them of Dr. Betruger's experiments. Ishii cryptically adds, "The devil is real...I know, I built his cage". Suddenly, the main portal in Delta Labs activates and demonic spirits come pouring out. Ishii is possessed by one of these demon spirits (as are many other humans throughout the base) and he becomes a zombie as a result. Ishii is therefore the first enemy to confront the player.

It is also possible to kill Ishii before he is possessed.