US Doctor Who fans are being urged to keep the plot of Saturday's finale secret after DVDs of the series were sent out early in error.
BBC Worldwide said "a small number" of fans had been sent pre-ordered DVDs three weeks early.
It asked those with the DVD not to reveal plot details which would ruin the "viewing pleasure" of others.
It promised footage of current Doctor Matt Smith with predecessor David Tennant "if everyone keeps the secret".
"A small number of US Doctor Who fans have received their series seven part two DVD three weeks early," BBC Worldwide said in a statement.
"We are asking fans who may have the discs not to divulge plot details so that fellow fans who have yet to see the episodes do not have their viewing pleasure ruined."
It said BBC Worldwide was "currently investigating how this has happened".
It added executive producer and lead writer Steven Moffat had promised the special video featuring Smith and Tennant if the secret was kept.
Source: BBC
BBC Worldwide said "a small number" of fans had been sent pre-ordered DVDs three weeks early.
It asked those with the DVD not to reveal plot details which would ruin the "viewing pleasure" of others.
It promised footage of current Doctor Matt Smith with predecessor David Tennant "if everyone keeps the secret".
"A small number of US Doctor Who fans have received their series seven part two DVD three weeks early," BBC Worldwide said in a statement.
"We are asking fans who may have the discs not to divulge plot details so that fellow fans who have yet to see the episodes do not have their viewing pleasure ruined."
It said BBC Worldwide was "currently investigating how this has happened".
It added executive producer and lead writer Steven Moffat had promised the special video featuring Smith and Tennant if the secret was kept.
Source: BBC
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