Dark Tower's production reads like a cautionary parable of late–studio-era producer dominance. The script, written by Ken Wiederhorn from a story by Robert J. Avrech and produced by Tom Fox's Greenfox Films in association with Sandy Howard's Howard International Pictures, was intended to be directed by Wiederhorn. Financing delays and personal problems forced Wiederhorn off the schedule; he retained a contractually-obligated executive producer credit but—contrary to repeated listings on IMDb and TCM—insisted he was never on set and never saw the finished picture. With production due to start in three weeks and financing in flux, Sandy Howard phoned veteran director Freddie Francis and lured him to the project, which was shot on location in Barcelona. Early turbulence continued: musicians-turned-actors Roger Daltrey and Lucy Gutteridge dropped out (Francis later attributed Daltrey's departure to poor performance and Gutteridge's struggles), forcing recasting with Michael Moriarty and Jenny Agutter, and Howard even sued three companies that failed to deliver promised funds, a legal battle that further hamstrung the shoot.
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