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In page Doctor Who:

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Only four episodes have premiere showings on channels other than BBC One. The 1983 20th-anniversary special "The Five Doctors" had its debut on 23 November (the actual date of the anniversary) on a number of PBS stations two days before its BBC One broadcast. The 1988 story Silver Nemesis was broadcast with all three episodes airing back to back on TVNZ in New Zealand in November, after the first episode had been shown in the UK but before the final two instalments had aired there.[citation needed]