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Many science fiction books, especially children's, were made into films, animation and TV. The most adapted Russian SF author was Bulychov; of the numerous films based on "Alisa Selezneva" stories, animation "Mystery of the Third Planet" (1981) is probably the most popular. Other Bulychov-based films include "Per Aspera Ad Astra" (1981), "Guest from the Future" (1985), "Two Tickets to India" (1985), "The Pass" (1988) and "The Witches Cave" (1990). Andrey Tarkovsky's "Stalker" (1979) was written by the Strugatskys, and is loosely based on their "Roadside Picnic"; there were also less successful films based on "Dead Mountaineer's Hotel" (1979) and "Hard to Be a God" (1989). "Aelita" (1924) was the first Soviet SF film, and "Engineer Garin" was made into film twice, in 1965 and in 1973. "Amphibian Man" (1962), "The Andromeda Nebula" (1967), "" (1973), "Heart of a Dog" (1988), "Sannikov's Land" (1974) and "Electronic" (1980) were filmed as well.