diff --git a/src/xenia/kernel/xam/profile_manager.cc b/src/xenia/kernel/xam/profile_manager.cc
index 33bb26479..66535d619 100644
--- a/src/xenia/kernel/xam/profile_manager.cc
+++ b/src/xenia/kernel/xam/profile_manager.cc
@@ -27,6 +27,16 @@ DEFINE_string(logged_profile_slot_2_xuid, "",
 DEFINE_string(logged_profile_slot_3_xuid, "",
               "XUID of the profile to load on boot in slot 3", "Profiles");
 
+DEFINE_string(
+    create_profile_if_none, "",
+    "Reverse-engineering aid: if no profile exists on disk, create one with "
+    "this gamertag at startup and sign it in. Without a signed-in profile the "
+    "title screen's (A) opens the Sign In dialog and the game goes no further, "
+    "and this container has no way to type a gamertag into it: the dialog is "
+    "an ImGui text field and synthetic X key events never reach it. Ignored "
+    "when a profile already exists.",
+    "Profiles");
+
 namespace xe {
 namespace kernel {
 namespace xam {
@@ -105,6 +115,17 @@ ProfileManager::ProfileManager(KernelState* kernel_state,
     LoadAccount(account_xuid);
   }
 
+  // RE aid: bootstrap a profile for scripted runs (see the cvar's help). The
+  // fixed XUID is what makes it usable from a script — `default_xuid` gives
+  // 0xB13EBABEBABEBABE every time, so a run can pass
+  // --logged_profile_slot_0_xuid=B13EBABEBABEBABE and be deterministic.
+  if (accounts_.empty() && !cvars::create_profile_if_none.empty()) {
+    const bool ok =
+        CreateProfile(cvars::create_profile_if_none, true, true);
+    XELOGI("ProfileManager: RE bootstrap profile '{}' -> {}",
+           cvars::create_profile_if_none, ok ? "created" : "FAILED");
+  }
+
   if (!cvars::logged_profile_slot_0_xuid.empty()) {
     Login(xe::string_util::from_string<uint64_t>(
               cvars::logged_profile_slot_0_xuid, true),