diff --git a/src/alien.c b/src/alien.c
index e7d42fa..16bfe9b 100644
--- a/src/alien.c
+++ b/src/alien.c
@@ -1190,7 +1190,11 @@ void aliens_init()
 	}
 }
 
-int alien_add()
+/* Adds an alien.  If spawnedMisnTarget is non-NULL, it is set to 1 if
+ * a mission target which can be forced with game.forceMisnTarget was
+ * spawned (or otherwise left unchanged).
+ */
+int alien_add(int *spawnedMisnTarget)
 {
 	int index = alien_getFreeIndex();
 
@@ -1315,10 +1319,19 @@ int alien_add()
 		&& (game.area != MISN_SIVEDI)
 		&& (game.area != MISN_MARS))
 	{
-		if ((game.system == SYSTEM_EYANANTH) && (game.area == MISN_INTERCEPTION))
+		if ((game.system == SYSTEM_EYANANTH)
+			&& (game.area == MISN_INTERCEPTION))
 		{
-			if (CHANCE(1. / 5.))
+			if (CHANCE(1. / 5.)
+				|| (game.difficulty != DIFFICULTY_ORIGINAL
+					&& game.forceMisnTarget))
+			{
 				randEnemy = CD_SLAVETRANSPORT;
+				game.forceMisnTarget = 0;
+
+				if (spawnedMisnTarget != NULL)
+					*spawnedMisnTarget = 1;
+			}
 		}
 
 		if (CHANCE(1. / 6.))
diff --git a/src/alien.h b/src/alien.h
index 6a8a631..fcfb435 100644
--- a/src/alien.h
+++ b/src/alien.h
@@ -29,7 +29,7 @@ extern Object aliens[ALIEN_MAX];
 void alien_nerf(int index);
 void alien_defs_init();
 void aliens_init();
-int alien_add();
+int alien_add(int *spawnedMisnTarget);
 void alien_addDrone(Object *hostAlien);
 void alien_addSmallAsteroid(Object *hostAlien);
 void alien_addFriendly(int type);
diff --git a/src/game.c b/src/game.c
index 604852c..291e582 100644
--- a/src/game.c
+++ b/src/game.c
@@ -104,6 +104,8 @@ void game_init()
 	game.slavesRescued = 0;
 	game.experimentalShield = 1000;
 
+	game.forceMisnTarget = 1;
+
 	game.timeTaken = 0;
 
 	game.stationedPlanet = -1;
@@ -2523,6 +2525,7 @@ void game_getDifficultyText(char *dest, int difficulty)
 
 int game_mainLoop()
 {
+	int spawnedMisnTarget;
 	float chance;
 
 	engine_resetLists();
@@ -2541,8 +2544,12 @@ int game_mainLoop()
 	if (game.area == MISN_ELAMALE)
 		aliens[ALIEN_KLINE].active = 0;
 
+	spawnedMisnTarget = 0;
 	for (int i = 0 ; i < engine.maxAliens ; i++)
-		alien_add();
+		alien_add(&spawnedMisnTarget);
+
+	if (!spawnedMisnTarget)
+		game.forceMisnTarget = 1;
 
 	if (game.hasWingMate1)
 		alien_addFriendly(ALIEN_PHOEBE);
@@ -2594,7 +2601,9 @@ int game_mainLoop()
 
 		if ((game.system == SYSTEM_MORDOR) && (game.experimentalShield > 0))
 		{
-			if (CHANCE(4. / 5.))
+			if (CHANCE(4. / 5.)
+				|| (game.difficulty != DIFFICULTY_ORIGINAL
+					&& game.forceMisnTarget))
 			{
 				aliens[ALIEN_BOSS] = alien_defs[CD_CLOAKFIGHTER];
 				aliens[ALIEN_BOSS].owner = &aliens[ALIEN_BOSS];
@@ -2605,7 +2614,10 @@ int game_mainLoop()
 				aliens[ALIEN_BOSS].y = player.y;
 				player_setTarget(ALIEN_BOSS);
 				aliens[ALIEN_BOSS].shield = game.experimentalShield;
+				game.forceMisnTarget = 0;
 			}
+			else
+				game.forceMisnTarget = 1;
 		}
 
 		// Note: music is started here only for interceptions.  For
@@ -2893,7 +2905,7 @@ int game_mainLoop()
 			WRAP_ADD(engine.addAliens, -1, 0, mission.addAliens);
 			if ((engine.addAliens == 0) && (allowableAliens > 0))
 			{
-				allowableAliens -= alien_add();
+				allowableAliens -= alien_add(NULL);
 			}
 		}
 
diff --git a/src/game.h b/src/game.h
index 5f483ed..ecf6bac 100644
--- a/src/game.h
+++ b/src/game.h
@@ -64,6 +64,9 @@ typedef struct Game_ {
 	// remaining shield for experimental fighter
 	int experimentalShield;
 
+	// Whether to force interception targets to appear
+	int forceMisnTarget;
+
 	Uint32 timeTaken; // In seconds
 	int missionCompleted[MAX_PLANETS];
 
diff --git a/src/intermission.c b/src/intermission.c
index 755193a..9106c16 100644
--- a/src/intermission.c
+++ b/src/intermission.c
@@ -179,6 +179,7 @@ void intermission_updateSystemStatus()
 		game.stationedPlanet = 0;
 		game.system = 1;
 		game.area = MISN_RESCUESLAVES;
+		game.forceMisnTarget = 1;
 		intermission_initPlanets(game.system);
 
 		if (game.difficulty == DIFFICULTY_ORIGINAL)
@@ -189,6 +190,7 @@ void intermission_updateSystemStatus()
 		game.stationedPlanet = 0;
 		game.system = 2;
 		game.area = MISN_CLOAKFIGHTER;
+		game.forceMisnTarget = 1;
 		intermission_initPlanets(game.system);
 
 		if (game.difficulty == DIFFICULTY_ORIGINAL)