  We report on the discovery in the Gaia DR3 astrometric and spectroscopic
catalog of a new polar stream that is found as an over-density in action space.
This structure is unique as it has an extremely large apocenter distance,
reaching beyond 100 kpc, and yet is detected as a coherent moving structure in
the Solar neighborhood with a width of $\sim 4$ kpc. A sub-sample of these
stars that was fortuitously observed by LAMOST has a mean spectroscopic
metallicity of $\langle {\rm [Fe/H]}\rangle = -1.60^{+0.15}_{-0.16}$ dex and
possesses a resolved metallicity dispersion of $\sigma({\rm [Fe/H]}) =
0.32^{+0.17}_{-0.06}$ dex. The physical width of the stream, the metallicity
dispersion and the vertical action spread indicate that the progenitor was a
dwarf galaxy. The existence of such a coherent and highly radial structure at
their pericenters in the vicinity of the Sun suggests that many other dwarf
galaxy fragments may be lurking in the outer halo.
