Both episodes were recovered from a collector last year and their existence was revealed at a screening at the BFI in London last December. The episode of The Underwater Menace was shown in full at the Missing Believed Wiped event but only an excerpt of about 10 minutes from Galaxy 4 was played, making the Cardiff screening the first time the whole episode had been seen in the UK since its initial transmission in September 1965.
The event was attended by Peter Purves, who played Steven in Galaxy 4, along with Anneke Wills and Frazer Hines, who played Polly and Jamie in The Underwater Menace. Following the screening, all three joined current show-runner Steven Moffat to answer questions about their time on the programme.
The panel was hosted by Gary Russell, and the event was attended by many other luminaries from the Doctor Who world, including some of the Restoration Team, who were greeted with much applause.
There is no news as to when the episodes will be released on DVD, although the BBC has said it is considering releasing them on iTunes.
With thanks to Greg James