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. As DVDs are printed in the UK only, this affects other countries as well.