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We present the goals, strategy and first results of the high-cadence Galacticplane survey using the Zwicky Transient Facility (ZTF). The goal of the surveyis to unveil the Galactic population of short-period variable stars, includingshort period binaries and stellar pulsators with periods less than a few hours.Between June 2018 and January 2019, we observed 64 ZTF fields resulting in 2990deg$^2$ of high stellar density in ZTF-$r$ band along the Galactic Plane. Eachfield was observed continuously for 1.5 to 6 hrs with a cadence of 40 sec. Mostfields have between 200 and 400 observations obtained over 2-3 continuousnights. As part of this survey we extract a total of $\approx$230 millionindividual objects with at least 80 epochs obtained during the high-cadenceGalactic Plane survey reaching an average depth of ZTF-$r$ $\approx$20.5 mag.For four selected fields with 2 million to 10 million individual objects perfield we calculate different variability statistics and find that $\approx$1-2%of the objects are astrophysically variable over the observed period. Wepresent a progress report on recent discoveries, including a new class ofcompact pulsators, the first members of a new class of Roche Lobe filling hotsubdwarf binaries as well as new ultracompact double white dwarfs and flaringstars. Finally we present a sample of 12 new single-mode hot subdwarf B-starpulsators with pulsation amplitudes between ZTF-$r$ = 20-76 mmag and pulsationperiods between $P$ = 5.8-16 min with a strong cluster of systems with periods$\approx$ 6 min. All of the data have now been released in either ZTF DataRelease 3 or data release 4.

Year 1 of the ZTF high-cadence Galactic Plane Survey: Strategy, goals, and early results on new single-mode hot subdwarf B-star pulsators