n 'The Philadelphia Experiment', a secret government research project tries reviving the World War II "Philadelphia Experiment," which was an attempt to create a cloaking device to render warships invisible. When the experiment succeeds, it brings back the original ship (the Eldridge) that disappeared during the first test in 1943 - which brings death and destruction to the 21st century. It's up to the sole survivor (Lea) of the first experiment and his granddaughter (Ullerup) to stop it.

Overview from themoviedb.org