A prototype developed by Vid Kidz to run on Williams hardware.
The VidKidz discs do have source and binary files for the game so someone should be able to create a working MAME driver for it if they wanted to.
No relation to Journey by Stern which became Conquest by Tago. VidKidz/Williams Conquest is a different game: horizontal; spinner, 2 buttons. Stern Journey = Tago Conquest, which is vertical with 4 buttons.
According to Larry DeMar, the game was temporarily postponed in order to work on Robotron, then shelved permanently when Williams' Sinistar was developed.