The UK DVD and video versions of the episodes "To The Death" and "Sons And Daughters" have been cut. A neck-break, and the accompanying sound are removed from the former, due to it being regarded as too strong. A Klingon ritual involving two people exchanging blood is removed from the latter. Given the risks of HIV transmission - and the established teenage audience for Star Trek - it was felt by the BBFC that this should be removed regardless of category to prevent any viewers emulating this.