Wikipedia
Electrocop is a 1989 video game developed by Epyx and published by Atari. It was one of the first games developed for the Atari Lynx, and was released with the platform's launch.
From the game's opening: "The Criminal Brain has kidnapped the President's daughter and you have to go save her. You, Electrocop, have to enter a fortress to save her with loads of robots to attack, doors to hack open and a few bonus games within the terminals to play while you wait."
A long-running rumor was that Electrocop was initially developed as a 3D sequel to Impossible Mission. However, when asked about this rumor, Electrocop developer Greg Omi said, "It's funny, but I can't remember if it was supposed to be a sequel to Impossible Mission or not. I remember writing a story and basic game design and pitching it to RJ [Mical], but I don't remember if they were asking for a sequel."