Search Out Science (series)
From Tardis Wiki, the free Doctor Who reference
Search Out Science was an educational BBC television documentary series produced for children.
A special episode, entitled "Search Out Space [+]Loading...["Search Out Space (TV story)"]", was aired on BBC Two crossing the series over with Doctor Who, with Sylvester McCoy reprising his role as the Seventh Doctor. This was the only episode of the series to be fiction.
