Popular dramas such as "Doctor Who" and "Z-Cars" continued into the new decade, and were joined by costume dramas following "The Forsyte Saga" such as "The Pallisers", "The Onedin Line" and "Poldark". Family-audience based period dramas, often adaptations such as "The Eagle of the Ninth" (1977), were popular on Sunday afternoons, with the 'Classic Serial' strand which ran there becoming something of an institution until the early 1990s. Another success between 1973 and 1977 was the popular "Warship" drama series, filmed with a documentary-like look for forty-five episodes over four seasons on a Royal Navy frigate. Along with many BBC dramas of the decade, "Warship" was also very successful in countries such as Ireland and Australia.