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Mr. Pebbles was the first cat launched into space.
Mr. Pebbles is mentioned in Fallout 4 on posters scattered throughout the world, and appears as the legendary version of the "Persian" cat that can be obtained.
Behind the scenesEdit
|The following is based on unverified behind the scenes information and has not been confirmed by canon sources.|
This is possibly a reference to Laika the first dog sent to space by the U.S.S.R. in 1957.