BAFTA Cymru has 35 pairs of tickets up for grabs for the screening, which will take place on Wednesday 26th September at Cineworld in Mary Ann Street at 6.30pm.
Afterwards, there will be a question-and-answer session with showrunner Steven Moffat, executive producer Caroline Skinner, producer Marcus Wilson, and production designer Michael Pickwoad.
To be in with a chance of winning a pair of tickets, you'll need to e-mail your name and e-mail address to infocymru@bafta.org by midnight tonight.
A random draw of names will be held tomorrow (Friday) and the successful entrants will get their notification by Monday.
BAFTA Cymru states that the tickets aren't transferable, nor will transport costs be covered. In addition, any under-16s will have to have an adult with them.
The episode will be broadcast in the UK on BBC One on Saturday 29th September at 7.20pm.
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