Jeff The Killer is the main antagonist of Abandoned: Discovery Island (Jeff The Killer), and will be one of the easter eggs in Abandoned: Discovery Island, appearing as a pivotal antagonist to the game. Jeff The Killer is found in his minigame after going through Night 1 without shutting off a camera.
Jeff The Killer will be added as an easter egg in the new update of Abandoned: Discovery Island, and has his own creepypasta. There is no gameplay of seeing Jeff, he will be added in new Jeffery's play mingame based on the game Abandoned: Discovery Island (Jeff The Killer) by Photo-Negative Mickey. Jeff's original purpose was to be a mini-game after Night 1 if the player manages to get through the whole night without shutting off a camera.
Jeff The Killer seems to wear a white hooded jacket which is covered in blood, with a black shirt worn underneath. Jeff's face includes his whole mouth missing showing his exposed, rotten teeth, which a blood outline stained on the skin around his teeth. Dry, calcified blood is also visible on his face, dripping down his eyes. His eyes have a dark outline to them, which his eyes seem to be like a wide open look. Jeff also has long yet brittle hair. His fingers also has brittle fingernails.
In his minigame or Abandoned: Discovery Island (Jeff The Killer), Jeff The Killer will wander around the island off-camera before going into the office. Like Photo-Negative Mickey, he will show up on either side of the Office. To ward him off as the player cannot shut off a camera on this night (due to the power outage), the player must hide under the desk until they hear his footsteps, but they shouldn't hide under the desk for too long, or else the dread bar will become empty, making the player unable to hide. Doing nothing while Jeff is in the Office will cause him to kill the player.