Echo SevenCanonLegendsInfinities Echo Seven was a callsign used by the Alliance to Restore the Republic during its time in Echo Base on the ice planet Hoth. Captain Han Solo used this callsign while scouting for lifeforms in the frozen wastes. AppearancesStar Wars: Episode V The Empire Strikes Back (First appearance) (Unknown)Unknown UnknownNoneThe Empire Strikes Back: So You Want to Be a Jedi? (Unknown)Unknown UnknownNoneThe Empire Strikes Back: So You Want to Be a Jedi? audiobook (Unknown)Unknown UnknownNoneStar Wars: The Empire Strikes Back junior novelization (Unknown)Unknown UnknownNone