diff --git a/CMakeLists.txt b/CMakeLists.txt
index 88e3c5a3..64075b94 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -71,6 +71,7 @@ add_executable(newserv
   src/ProxyCommands.cc
   src/ProxyServer.cc
   src/PSOEncryption.cc
+  src/PSOGCObjectGraph.cc
   src/PSOProtocol.cc
   src/Quest.cc
   src/RareItemSet.cc
diff --git a/src/Main.cc b/src/Main.cc
index bbd68473..8fe89291 100644
--- a/src/Main.cc
+++ b/src/Main.cc
@@ -19,6 +19,7 @@
 #include "Loggers.hh"
 #include "NetworkAddresses.hh"
 #include "ProxyServer.hh"
+#include "PSOGCObjectGraph.hh"
 #include "ReplaySession.hh"
 #include "SendCommands.hh"
 #include "Server.hh"
@@ -326,6 +327,7 @@ enum class Behavior {
   DECODE_SJIS,
   EXTRACT_GSL,
   SHOW_EP3_DATA,
+  PARSE_OBJECT_GRAPH,
   REPLAY_LOG,
   CAT_CLIENT,
 };
@@ -340,6 +342,7 @@ static bool behavior_takes_input_filename(Behavior b) {
          (b == Behavior::DECODE_QUEST_FILE) ||
          (b == Behavior::DECODE_SJIS) ||
          (b == Behavior::EXTRACT_GSL) ||
+         (b == Behavior::PARSE_OBJECT_GRAPH) ||
          (b == Behavior::REPLAY_LOG);
 }
 
@@ -377,6 +380,7 @@ int main(int argc, char** argv) {
   const char* output_filename = nullptr;
   const char* replay_required_access_key = "";
   const char* replay_required_password = "";
+  uint32_t root_object_address = 0;
   struct sockaddr_storage cat_client_remote;
   for (int x = 1; x < argc; x++) {
     if (!strcmp(argv[x], "--help")) {
@@ -442,6 +446,8 @@ int main(int argc, char** argv) {
       skip_big_endian = true;
     } else if (!strcmp(argv[x], "--show-ep3-data")) {
       behavior = Behavior::SHOW_EP3_DATA;
+    } else if (!strcmp(argv[x], "--parse-object-graph")) {
+      behavior = Behavior::PARSE_OBJECT_GRAPH;
     } else if (!strcmp(argv[x], "--replay-log")) {
       behavior = Behavior::REPLAY_LOG;
     } else if (!strcmp(argv[x], "--extract-gsl")) {
@@ -450,6 +456,8 @@ int main(int argc, char** argv) {
       replay_required_password = &argv[x][19];
     } else if (!strncmp(argv[x], "--require-access-key=", 21)) {
       replay_required_access_key = &argv[x][21];
+    } else if (!strncmp(argv[x], "--root-addr=", 12)) {
+      root_object_address = strtoul(&argv[x][12], nullptr, 16);
     } else if (!strncmp(argv[x], "--config=", 9)) {
       config_filename = &argv[x][9];
     } else if (!strcmp(argv[x], "-") || argv[x][0] != '-') {
@@ -742,6 +750,13 @@ int main(int argc, char** argv) {
       break;
     }
 
+    case Behavior::PARSE_OBJECT_GRAPH: {
+      string data = read_input_data();
+      PSOGCObjectGraph g(data, root_object_address);
+      g.print(stdout);
+      break;
+    }
+
     case Behavior::REPLAY_LOG:
     case Behavior::RUN_SERVER: {
       signal(SIGPIPE, SIG_IGN);
diff --git a/src/PSOGCObjectGraph.cc b/src/PSOGCObjectGraph.cc
new file mode 100644
index 00000000..75afcd96
--- /dev/null
+++ b/src/PSOGCObjectGraph.cc
@@ -0,0 +1,101 @@
+#include "PSOGCObjectGraph.hh"
+
+#include "Text.hh"
+
+using namespace std;
+
+
+
+struct TObjectVTable {
+  be_uint32_t unused_a1;
+  be_uint32_t unused_a2;
+  be_uint32_t destroy;
+  be_uint32_t update;
+  be_uint32_t render;
+  be_uint32_t render_shadow;
+} __attribute__((packed));
+
+struct TObject {
+  be_uint32_t type_name_addr;
+  be_uint16_t flags;
+  parray<uint8_t, 2> unused;
+  be_uint32_t prev_sibling_addr;
+  be_uint32_t next_sibling_addr;
+  be_uint32_t parent_addr;
+  be_uint32_t children_head_addr;
+  be_uint32_t vtable_addr;
+} __attribute__((packed));
+
+PSOGCObjectGraph::PSOGCObjectGraph(
+    const string& memory_data, uint32_t root_address) {
+  StringReader r(memory_data);
+  this->root = this->parse_object_memo(r, root_address);
+}
+
+shared_ptr<PSOGCObjectGraph::VTable> PSOGCObjectGraph::parse_vtable_memo(
+    StringReader& r, uint32_t addr) {
+  try {
+    return this->all_vtables.at(addr);
+  } catch (const out_of_range&) { }
+
+  const auto& vt = r.pget<TObjectVTable>(addr & 0x01FFFFFF);
+  auto ret = this->all_vtables.emplace(addr, new VTable()).first->second;
+  ret->address = addr;
+  ret->destroy_addr = vt.destroy;
+  ret->update_addr = vt.update;
+  ret->render_addr = vt.render;
+  ret->render_shadow_addr = vt.render_shadow;
+  return ret;
+}
+
+shared_ptr<PSOGCObjectGraph::Object> PSOGCObjectGraph::parse_object_memo(
+    StringReader& r, uint32_t addr) {
+  try {
+    return this->all_objects.at(addr);
+  } catch (const out_of_range&) { }
+
+  const auto& obj = r.pget<TObject>(addr & 0x01FFFFFF);
+  string type_name = r.pget_cstr(obj.type_name_addr & 0x01FFFFFF);
+
+  auto ret = this->all_objects.emplace(addr, new Object()).first->second;
+  ret->address = addr;
+  ret->flags = obj.flags;
+  ret->type_name = move(type_name);
+  ret->vtable = this->parse_vtable_memo(r, obj.vtable_addr);
+  if (obj.parent_addr) {
+    ret->parent = this->parse_object_memo(r, obj.parent_addr);
+  }
+  if (obj.children_head_addr) {
+    uint32_t child_addr = obj.children_head_addr;
+    while (child_addr) {
+      ret->children.emplace_back(this->parse_object_memo(r, child_addr));
+      child_addr = r.pget<TObject>(child_addr & 0x01FFFFFF).next_sibling_addr;
+    }
+  }
+  return ret;
+}
+
+void PSOGCObjectGraph::print(FILE* stream) const {
+  this->root->print(stream);
+}
+
+
+
+void PSOGCObjectGraph::Object::print(FILE* stream, size_t indent_level) const {
+  for (size_t z = 0; z < indent_level; z++) {
+    fputc(' ', stream);
+    fputc(' ', stream);
+  }
+  fprintf(stream, "%s +%04hX @ %08" PRIX32 " (VT %08" PRIX32 ": destroy=%08" PRIX32 " update=%08" PRIX32 " render=%08" PRIX32 " render_shadow=%08" PRIX32 ")\n",
+      this->type_name.c_str(),
+      this->flags,
+      this->address,
+      this->vtable->address,
+      this->vtable->destroy_addr,
+      this->vtable->update_addr,
+      this->vtable->render_addr,
+      this->vtable->render_shadow_addr);
+  for (const auto& child : this->children) {
+    child->print(stream, indent_level + 1);
+  }
+}
diff --git a/src/PSOGCObjectGraph.hh b/src/PSOGCObjectGraph.hh
new file mode 100644
index 00000000..12b16194
--- /dev/null
+++ b/src/PSOGCObjectGraph.hh
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <inttypes.h>
+
+#include <memory>
+#include <phosg/Encoding.hh>
+#include <phosg/Strings.hh>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+
+
+struct PSOGCObjectGraph {
+  PSOGCObjectGraph(const std::string& memory_data, uint32_t root_address);
+
+  void print(FILE* stream) const;
+
+  struct VTable {
+    uint32_t address;
+    uint32_t destroy_addr;
+    uint32_t update_addr;
+    uint32_t render_addr;
+    uint32_t render_shadow_addr;
+  };
+
+  struct Object {
+    uint32_t address;
+    uint16_t flags;
+    std::string type_name;
+    std::shared_ptr<VTable> vtable;
+    std::shared_ptr<Object> parent;
+    std::vector<std::shared_ptr<Object>> children;
+
+    void print(FILE* stream, size_t indent_level = 0) const;
+  };
+
+  std::shared_ptr<Object> root;
+  std::unordered_map<uint32_t, std::shared_ptr<Object>> all_objects;
+  std::unordered_map<uint32_t, std::shared_ptr<VTable>> all_vtables;
+
+  std::shared_ptr<Object> parse_object_memo(StringReader& r, uint32_t addr);
+  std::shared_ptr<VTable> parse_vtable_memo(StringReader& r, uint32_t addr);
+};