diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index 30a9d2e..9c3afb4 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -181,6 +181,18 @@ implement main0 () = ()
       input: `PRINT x`,
     },
     template: `PRINT "Hello, world!"
+`,
+  },
+  battlestar: {
+    aliases: ["battlestarc", "bts"],
+    name: "Battlestar",
+    main: "main.bts",
+    run: "bts main.bts",
+    template: `const message = "Hello, world!\n"
+
+fun main
+    syscall(1, 1, message, len(message))
+end
 `,
   },
   beatnik: {
diff --git a/scripts/docker-install-phase3a.bash b/scripts/docker-install-phase3a.bash
index 93b9ded..2379a6e 100755
--- a/scripts/docker-install-phase3a.bash
+++ b/scripts/docker-install-phase3a.bash
@@ -39,6 +39,10 @@ bwbasic
 # Bash
 bash
 
+# Battlestar
+golang
+yasm
+
 # BrainF
 beef
 
diff --git a/scripts/docker-install-phase6.bash b/scripts/docker-install-phase6.bash
index cf2c190..eac280c 100755
--- a/scripts/docker-install-phase6.bash
+++ b/scripts/docker-install-phase6.bash
@@ -5,6 +5,15 @@ set -o pipefail
 set -x
 pushd /tmp >/dev/null
 
+# Battlestar
+git clone https://github.com/xyproto/battlestar.git
+pushd battlestar >/dev/null
+make
+mv cmd/battlestarc/battlestarc /usr/local/bin/
+mv scripts/bts.sh /usr/local/bin/bts
+popd >/dev/null
+rm -rf battlestar
+
 # Beatnik
 git clone https://github.com/catseye/Beatnik.git
 sed -i 's#env python#env python2#' Beatnik/script/beatnik.py