diff --git a/src/galaxy/galacticMap.c b/src/galaxy/galacticMap.c
index 24bb2c2..085ca24 100644
--- a/src/galaxy/galacticMap.c
+++ b/src/galaxy/galacticMap.c
@@ -108,6 +108,8 @@ void initGalacticMap(void)
 	
 	getWidget("ok", "stats")->action = statsOK;
 	
+	updateStarSystemMissions();
+	
 	endSectionTransition();
 	
 	playMusic("music/Pressure.ogg");
@@ -402,28 +404,6 @@ static void drawGalaxy(void)
 
 static void selectStarSystem(void)
 {
-	Mission *mission, *prev;
-	
-	selectedMission = selectedStarSystem->missionHead.next;
-	
-	selectedStarSystem->completedMissions = selectedStarSystem->totalMissions = 0;
-	
-	prev = &selectedStarSystem->missionHead;
-	
-	for (mission = selectedStarSystem->missionHead.next ; mission != NULL ; mission = mission->next)
-	{
-		selectedStarSystem->totalMissions++;
-		
-		if (mission->completed)
-		{
-			selectedStarSystem->completedMissions++;
-		}
-		
-		mission->available = prev->completed;
-		
-		prev = mission;
-	}
-	
 	missionListStart = 0;
 	selectedMissionIndex = 0;
 	
diff --git a/src/galaxy/galacticMap.h b/src/galaxy/galacticMap.h
index 91ba33d..5ab9f4f 100644
--- a/src/galaxy/galacticMap.h
+++ b/src/galaxy/galacticMap.h
@@ -64,6 +64,8 @@ extern void playSound(int id);
 extern void blitRotated(SDL_Texture *texture, int x, int y, int angle);
 extern void initStatsDisplay(void);
 extern void handleStatsKB(void);
+extern Mission *getMission(char *filename);
+extern void updateStarSystemMissions(void);
 
 extern App app;
 extern Colors colors;
diff --git a/src/galaxy/mission.c b/src/galaxy/mission.c
index 3801ed0..63286cd 100644
--- a/src/galaxy/mission.c
+++ b/src/galaxy/mission.c
@@ -200,15 +200,19 @@ static void loadFighterGroups(cJSON *node)
 	}
 }
 
-Mission *getMission(StarSystem *starSystem, char *filename)
+Mission *getMission(char *filename)
 {
+	StarSystem *starSystem;
 	Mission *mission;
 	
-	for (mission = starSystem->missionHead.next ; mission != NULL ; mission = mission->next)
+	for (starSystem = game.starSystemHead.next ; starSystem != NULL ; starSystem = starSystem->next)
 	{
-		if (strcmp(mission->filename, filename) == 0)
+		for (mission = starSystem->missionHead.next ; mission != NULL ; mission = mission->next)
 		{
-			return mission;
+			if (strcmp(mission->filename, filename) == 0)
+			{
+				return mission;
+			}
 		}
 	}
 	
diff --git a/src/galaxy/starSystems.c b/src/galaxy/starSystems.c
index 4dfd43f..0e2cf9c 100644
--- a/src/galaxy/starSystems.c
+++ b/src/galaxy/starSystems.c
@@ -22,6 +22,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 static void loadStarSystem(cJSON *starSystemJSON);
 static void loadMissionMeta(char *filename, StarSystem *starSystem);
+static int isAvailable(Mission *mission, Mission *prev);
 
 void initStarSystems(void)
 {
@@ -89,6 +90,11 @@ static void loadMissionMeta(char *filename, StarSystem *starSystem)
 	STRNCPY(mission->description, cJSON_GetObjectItem(root, "description")->valuestring, MAX_DESCRIPTION_LENGTH);
 	STRNCPY(mission->filename, filename, MAX_DESCRIPTION_LENGTH);
 	
+	if (cJSON_GetObjectItem(root, "requires"))
+	{
+		STRNCPY(mission->requires, cJSON_GetObjectItem(root, "requires")->valuestring, MAX_DESCRIPTION_LENGTH);
+	}
+	
 	node = cJSON_GetObjectItem(root, "player");
 	
 	if (node)
@@ -174,6 +180,50 @@ void updateStarSystemDescriptions(void)
 	}
 }
 
+void updateStarSystemMissions(void)
+{
+	StarSystem *starSystem;
+	Mission *mission, *prev;
+	
+	for (starSystem = game.starSystemHead.next ; starSystem != NULL ; starSystem = starSystem->next)
+	{
+		starSystem->completedMissions = starSystem->totalMissions = 0;
+		
+		prev = &starSystem->missionHead;
+		
+		for (mission = starSystem->missionHead.next ; mission != NULL ; mission = mission->next)
+		{
+			starSystem->totalMissions++;
+			
+			if (mission->completed)
+			{
+				starSystem->completedMissions++;
+			}
+			
+			mission->available = isAvailable(mission, prev);
+			
+			prev = mission;
+		}
+	}
+}
+
+static int isAvailable(Mission *mission, Mission *prev)
+{
+	Mission *reqMission;
+	
+	if (mission->requires)
+	{
+		reqMission = getMission(mission->requires);
+			
+		if (reqMission != NULL)
+		{
+			return reqMission->completed;
+		}
+	}
+	
+	return prev->completed;
+}
+
 void destroyStarSystems(void)
 {
 	StarSystem *starSystem;
diff --git a/src/galaxy/starSystems.h b/src/galaxy/starSystems.h
index 48a53b0..90712ff 100644
--- a/src/galaxy/starSystems.h
+++ b/src/galaxy/starSystems.h
@@ -26,5 +26,6 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 extern char *readFile(char *filename);
 extern long lookup(char *name);
+extern Mission *getMission(char *filename);
 
 extern Game game;
diff --git a/src/structs.h b/src/structs.h
index 23ba54c..6b024b3 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -178,6 +178,7 @@ struct Mission {
 	char name[MAX_NAME_LENGTH];
 	char description[MAX_DESCRIPTION_LENGTH];
 	char filename[MAX_DESCRIPTION_LENGTH];
+	char requires[MAX_DESCRIPTION_LENGTH];
 	char pilot[MAX_NAME_LENGTH];
 	char squadron[MAX_NAME_LENGTH];
 	char craft[MAX_NAME_LENGTH];
diff --git a/src/system/load.c b/src/system/load.c
index 56714ba..7281667 100644
--- a/src/system/load.c
+++ b/src/system/load.c
@@ -22,7 +22,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 static void loadStats(cJSON *stats);
 static void loadStarSystems(cJSON *starSystemsJSON);
-static void loadMissions(StarSystem *starSystem, cJSON *missionsCJSON);
+static void loadMissions(cJSON *missionsCJSON);
 static void loadChallenges(Mission *mission, cJSON *challengesCJSON);
 
 void loadGame(void)
@@ -45,25 +45,22 @@ void loadGame(void)
 
 static void loadStarSystems(cJSON *starSystemsJSON)
 {
-	StarSystem *starSystem;
 	cJSON *starSystemJSON;
 	
 	for (starSystemJSON = starSystemsJSON->child ; starSystemJSON != NULL ; starSystemJSON = starSystemJSON->next)
 	{
-		starSystem = getStarSystem(cJSON_GetObjectItem(starSystemJSON, "name")->valuestring);
-		
-		loadMissions(starSystem, cJSON_GetObjectItem(starSystemJSON, "missions"));
+		loadMissions(cJSON_GetObjectItem(starSystemJSON, "missions"));
 	}
 }
 
-static void loadMissions(StarSystem *starSystem, cJSON *missionsCJSON)
+static void loadMissions(cJSON *missionsCJSON)
 {
 	Mission *mission;
 	cJSON *missionCJSON;
 	
 	for (missionCJSON = missionsCJSON->child ; missionCJSON != NULL ; missionCJSON = missionCJSON->next)
 	{
-		mission = getMission(starSystem, cJSON_GetObjectItem(missionCJSON, "filename")->valuestring);
+		mission = getMission(cJSON_GetObjectItem(missionCJSON, "filename")->valuestring);
 		
 		mission->completed = cJSON_GetObjectItem(missionCJSON, "completed")->valueint;
 		
diff --git a/src/system/load.h b/src/system/load.h
index c7ad636..a6d160c 100644
--- a/src/system/load.h
+++ b/src/system/load.h
@@ -26,7 +26,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 extern char *readFile(char *filename);
 extern StarSystem *getStarSystem(char *name);
-extern Mission *getMission(StarSystem *starSystem, char *filename);
+extern Mission *getMission(char *filename);
 extern Challenge *getChallenge(Mission *mission, int type);
 extern int lookup(char *lookup);
 extern char *getSaveFilePath(char *filename);