We present S82-20, an unusual redshift ≈3 object identified in SDSS-Stripe 82 broad-band images. The rest-frame ultraviolet spectrum of S82-20 shows emission lines from highly ionized species, including He 1640, and the C 1548, 1550 and O 1032, 1038 doublets. The high Ly luminosity (3.5 × 10 44 erg s −1), the high emission line equivalent widths (> 200Å for Ly), the FWHM of the emission lines (< 800km s −1), and the high ionization O line strongly support the interpretation that S82-20 is a Type II QSO. However, photoionization models using Type II QSO do not fully explain the measured C /He line ratio, which requires either some contribution from star-formation or high velocity shocks. Additionally, S82-20 is not detected at wavelengths longer than 2 m, in tension with the expectation of isotropically IR emission of a luminous QSO. We consider the possibility that S82-20 is a rare example of a changing-look QSO, observed in a temporarily low state, where the broad line region has faded, while the narrow line region still emits emission line. Otherwise, it may be a rare case of the short phase of the life of a massive galaxy, in which active star formation and accretion onto a supermassive black hole coexist.