In 1999, he founded the production company Uncharted Territory LLC with long-time friend and colleague Volker Engel. The first production, and Weigert's first film as a producer, "Coronado", was shot in 2001 in Mexico. The film was written by Weigert, Engel and director Claudio Faeh. In 2003, Weigert co-produced the film ' and served as visual effects director together with Volker Engel. "Dark Kingdom", aka "Ring of the Nibelungs" is based on the same Germanic myth as Richard Wagner's opera series "Der Ring des Nibelungen". In-between film productions, Uncharted Territory also created the Intermedia logo animation which premiered before ' and provided visual effects services for Roland Emmerich's "The Day After Tomorrow" in 2004. In 2005, Weigert wrote the screenplay "Southern Skies" and produced the miniseries "The Triangle" together with Engel and Kelly Van Horn, for executive producers Bryan Singer and Dean Devlin.