在这部第四度空间2动作/科幻/冒险片中,大卫·赫德格在1943年参加了一次失败的雷达隐身实验，使他在40年后步入了未来。他基因结构的异常使他得以穿越时间之门。这也使他对时间连续体的任何变化都很敏感。1993年的另一次灾难性的试验将一架隐形飞机通过时间门户，送入1943年的德国。同时，赫德格被拉进了大门，发现自己身处在可怕的1993年，那是纳粹在第二次世界大战中的胜利。
David Herdeg's participation in a failed 1943 experiment in radar invisibility has propelled him 40 years into the future. An aberration in his genetic makeup enabled him to pass through the portal of time. It has also made him sensitive to any alteration to the time continuum. Another disasterous experiment in 1993 sends a stealth aircraft through the time portal, into 1943 Germany. Simultaneously, Herdeg is pulled into the portal, and finds himself in the terrifying 1993 that resulted from a Nazi victory in World War II.
