Corona Pictures’ Gary Kurtz, whose credits as a producer include “Star Wars” and “American Graffiti,” has joined forces with helmer-scribe Peter Briggs on supernatural thriller “Panzer 88.”Pic centers on the German army crew of the world’s biggest tank, the King Tiger, who are sent to a snowy wasteland on the Russian border during WWII. There they stir up a supernatural creature that wreaks revenge for the destruction of a partisan village. Helmer Briggs, whose credits include “Hellboy,” co-wrote the screenplay with Aaron Mason and James Cowan. Principal photography for “Panzer 88,” which is budgeted at $20 million, will take place in Eastern Europe this year. Kurtz will be joined by his Corona Pictures producing partners Richard Johns (“Shadow of the Vampire”) and Rupert Jermyn. Briggs is also attached to direct his original screenplay “Mortis Rex,” a Roman-era supernatural thriller that was announced at the AFM, with Jim Jacks (“Tombstone,” “The Mummy” trilogy) producing and Intandem selling.