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This clip from episode one of the Doctor Who story 'The Enemy of the World' shows the Doctor, played by Patrick Troughton, going for a dip in the sea.
The 1967 episode is one of nine tracked down in a store room at a Nigerian TV station, where they were gathering dust.
Footage courtesy of BBC Worldwide.
The newly found programmes - which introduce the character of Alistair Lethbridge-Stewart, better known to audiences as The Brigadier - will be available on iTunes from today and will later come out on DVD.
Phillip Morris, the director of Television International Enterprises Archive, unearthed the programmes by looking up the records of overseas shipments of tapes made by the BBC.
The stories, The Enemy Of The World (1967) and The Web Of Fear (1968) and both starring Patrick Troughton as the second Doctor, have now been remastered by BBC Worldwide, the corporation's commercial arm.
Nine long-lost episodes of Doctor Who which have not been seen since the 1960s have been recovered after they were tracked down to a store room in Nigeria, gathering dust.
The discovery will cause much excitement for devotees of the long-running series, for which there are dozens of missing episodes dating back to its early years
The previously lost nine shows were among 11 traced to a television relay station and the find brings back to life an entire six-episode story, while another is almost complete.