diff --git a/direct/src/showbase/EventManager.py b/direct/src/showbase/EventManager.py
index 7bbb915915..14465120cb 100644
--- a/direct/src/showbase/EventManager.py
+++ b/direct/src/showbase/EventManager.py
@@ -76,6 +76,8 @@ class EventManager:
             return eventParameter.getStringValue()
         elif eventParameter.isWstring():
             return eventParameter.getWstringValue()
+        elif hasattr(eventParameter, 'isBytes') and eventParameter.isBytes():
+            return eventParameter.getBytesValue()
         elif eventParameter.isTypedRefCount():
             return eventParameter.getTypedRefCountValue()
         elif eventParameter.isEmpty():
diff --git a/dtool/src/dtoolbase/pvector.h b/dtool/src/dtoolbase/pvector.h
index 12e7c108ef..f8dcb21071 100644
--- a/dtool/src/dtoolbase/pvector.h
+++ b/dtool/src/dtoolbase/pvector.h
@@ -46,15 +46,15 @@ public:
   typedef std::vector<Type, allocator> base_class;
   typedef typename base_class::size_type size_type;
 
-  explicit pvector(TypeHandle type_handle = pvector_type_handle) : base_class(allocator(type_handle)) { }
+  explicit pvector(TypeHandle type_handle = get_type_handle(pvector<Type>)) : base_class(allocator(type_handle)) { }
   pvector(const pvector<Type> &copy) : base_class(copy) { }
   pvector(pvector<Type> &&from) noexcept : base_class(std::move(from)) {};
-  explicit pvector(size_type n, TypeHandle type_handle = pvector_type_handle) : base_class(n, Type(), allocator(type_handle)) { }
-  explicit pvector(size_type n, const Type &value, TypeHandle type_handle = pvector_type_handle) : base_class(n, value, allocator(type_handle)) { }
-  pvector(const Type *begin, const Type *end, TypeHandle type_handle = pvector_type_handle) : base_class(allocator(type_handle)) {
+  explicit pvector(size_type n, TypeHandle type_handle = get_type_handle(pvector<Type>)) : base_class(n, Type(), allocator(type_handle)) { }
+  explicit pvector(size_type n, const Type &value, TypeHandle type_handle = get_type_handle(pvector<Type>)) : base_class(n, value, allocator(type_handle)) { }
+  pvector(const Type *begin, const Type *end, TypeHandle type_handle = get_type_handle(pvector<Type>)) : base_class(allocator(type_handle)) {
     this->insert(this->end(), begin, end);
   }
-  pvector(std::initializer_list<Type> init, TypeHandle type_handle = pvector_type_handle) : base_class(std::move(init), allocator(type_handle)) { }
+  pvector(std::initializer_list<Type> init, TypeHandle type_handle = get_type_handle(pvector<Type>)) : base_class(std::move(init), allocator(type_handle)) { }
 
   pvector<Type> &operator =(const pvector<Type> &copy) {
     base_class::operator =(copy);
diff --git a/dtool/src/dtoolbase/register_type.cxx b/dtool/src/dtoolbase/register_type.cxx
index b67475e4f6..649c4ebe11 100644
--- a/dtool/src/dtoolbase/register_type.cxx
+++ b/dtool/src/dtoolbase/register_type.cxx
@@ -26,6 +26,7 @@ TypeHandle double_type_handle;
 TypeHandle float_type_handle;
 TypeHandle string_type_handle;
 TypeHandle wstring_type_handle;
+TypeHandle vector_uchar_type_handle;
 
 TypeHandle long_p_type_handle;
 TypeHandle int_p_type_handle;
@@ -59,6 +60,7 @@ void init_system_type_handles() {
     register_type(float_type_handle, "float");
     register_type(string_type_handle, "string");
     register_type(wstring_type_handle, "wstring");
+    register_type(vector_uchar_type_handle, "vector_uchar");
 
     register_type(int_p_type_handle, "int*");
     register_type(short_p_type_handle, "short*");
diff --git a/dtool/src/dtoolbase/register_type.h b/dtool/src/dtoolbase/register_type.h
index a15cc9ddb1..95b2c48548 100644
--- a/dtool/src/dtoolbase/register_type.h
+++ b/dtool/src/dtoolbase/register_type.h
@@ -19,6 +19,9 @@
 #include "typeHandle.h"
 #include "typeRegistry.h"
 
+template<class T>
+class pvector;
+
 /**
  * This inline function is just a convenient way to call
  * TypeRegistry::register_type(), along with zero to four
@@ -88,6 +91,7 @@ extern TypeHandle EXPCL_DTOOL_DTOOLBASE double_type_handle;
 extern TypeHandle EXPCL_DTOOL_DTOOLBASE float_type_handle;
 extern TypeHandle EXPCL_DTOOL_DTOOLBASE string_type_handle;
 extern TypeHandle EXPCL_DTOOL_DTOOLBASE wstring_type_handle;
+extern TypeHandle EXPCL_DTOOL_DTOOLBASE vector_uchar_type_handle;
 
 extern TypeHandle long_p_type_handle;
 extern TypeHandle int_p_type_handle;
@@ -175,6 +179,16 @@ INLINE TypeHandle _get_type_handle(const std::wstring *) {
   return wstring_type_handle;
 }
 
+template<class T>
+INLINE TypeHandle _get_type_handle(const pvector<T> *) {
+  return pvector_type_handle;
+}
+
+template<>
+INLINE TypeHandle _get_type_handle(const pvector<unsigned char> *) {
+  return vector_uchar_type_handle;
+}
+
 template<>
 INLINE TypeHandle _get_type_handle(const long * const *) {
   return long_p_type_handle;
diff --git a/dtool/src/dtoolutil/vector_uchar.cxx b/dtool/src/dtoolutil/vector_uchar.cxx
index 78750619bf..2087d20587 100644
--- a/dtool/src/dtoolutil/vector_uchar.cxx
+++ b/dtool/src/dtoolutil/vector_uchar.cxx
@@ -19,3 +19,25 @@
 #define NAME vector_uchar
 
 #include "vector_src.cxx"
+
+/**
+ * Writes a hex representation of the bytes to the output stream.
+ */
+std::ostream &
+operator << (std::ostream &out, const vector_uchar &data) {
+  static const char nibble_to_hex[] = "0123456789abcdef";
+
+  if (data.empty()) {
+    return out;
+  }
+
+  out << nibble_to_hex[(data[0] & 0xf0) >> 4];
+  out << nibble_to_hex[data[0] & 0xf];
+
+  for (size_t i = 1; i < data.size(); ++i) {
+    out << ' ';
+    out << nibble_to_hex[(data[i] & 0xf0) >> 4];
+    out << nibble_to_hex[data[i] & 0xf];
+  }
+  return out;
+}
diff --git a/dtool/src/dtoolutil/vector_uchar.h b/dtool/src/dtoolutil/vector_uchar.h
index 3700b4ba8d..e04fd89289 100644
--- a/dtool/src/dtoolutil/vector_uchar.h
+++ b/dtool/src/dtoolutil/vector_uchar.h
@@ -30,4 +30,7 @@
 
 #include "vector_src.h"
 
+EXPCL_DTOOL_DTOOLUTIL std::ostream &
+operator << (std::ostream &out, const vector_uchar &data);
+
 #endif
diff --git a/panda/src/event/eventParameter.I b/panda/src/event/eventParameter.I
index 1d3d168344..61cbacb0b8 100644
--- a/panda/src/event/eventParameter.I
+++ b/panda/src/event/eventParameter.I
@@ -63,6 +63,11 @@ EventParameter(const std::string &value) : _ptr(new EventStoreString(value)) { }
 INLINE EventParameter::
 EventParameter(const std::wstring &value) : _ptr(new EventStoreWstring(value)) { }
 
+/**
+ * Defines an EventParameter that stores a bytes value.
+ */
+INLINE EventParameter::
+EventParameter(const vector_uchar &value) : _ptr(new ParamBytes(value)) { }
 
 /**
  *
@@ -185,6 +190,28 @@ get_wstring_value() const {
   return ((const EventStoreWstring *)_ptr.p())->get_value();
 }
 
+/**
+ * Returns true if the EventParameter stores a binary bytes value, false
+ * otherwise.
+ */
+INLINE bool EventParameter::
+is_bytes() const {
+  if (is_empty()) {
+    return false;
+  }
+  return _ptr->is_of_type(ParamBytes::get_class_type());
+}
+
+/**
+ * Retrieves the value stored in the EventParameter.  It is only valid to call
+ * this if is_bytes() has already returned true.
+ */
+INLINE vector_uchar EventParameter::
+get_bytes_value() const {
+  nassertr(is_bytes(), vector_uchar());
+  return ((const ParamBytes *)_ptr.p())->get_value();
+}
+
 /**
  * Returns true if the EventParameter stores a TypedReferenceCount pointer,
  * false otherwise.  Note that a TypedReferenceCount is not exactly the same
diff --git a/panda/src/event/eventParameter.h b/panda/src/event/eventParameter.h
index 44e891e3c9..7994796b75 100644
--- a/panda/src/event/eventParameter.h
+++ b/panda/src/event/eventParameter.h
@@ -41,6 +41,7 @@ PUBLISHED:
   INLINE EventParameter(double value);
   INLINE EventParameter(const std::string &value);
   INLINE EventParameter(const std::wstring &value);
+  INLINE EventParameter(const vector_uchar &value);
 
   INLINE EventParameter(const EventParameter &copy);
   INLINE EventParameter &operator = (const EventParameter &copy);
@@ -59,6 +60,8 @@ PUBLISHED:
   INLINE std::string get_string_value() const;
   INLINE bool is_wstring() const;
   INLINE std::wstring get_wstring_value() const;
+  INLINE bool is_bytes() const;
+  INLINE vector_uchar get_bytes_value() const;
 
   INLINE bool is_typed_ref_count() const;
   INLINE TypedReferenceCount *get_typed_ref_count_value() const;
diff --git a/panda/src/putil/config_putil.cxx b/panda/src/putil/config_putil.cxx
index 9849cd5b84..c9e8e4b9b1 100644
--- a/panda/src/putil/config_putil.cxx
+++ b/panda/src/putil/config_putil.cxx
@@ -212,6 +212,7 @@ init_libputil() {
   FactoryParam::init_type();
   Namable::init_type();
   NodeCachedReferenceCount::init_type();
+  ParamBytes::init_type("ParamBytes");
   ParamMatrix3d::init_type("ParamMatrix3d");
   ParamMatrix3f::init_type("ParamMatrix3f");
   ParamMatrix4d::init_type("ParamMatrix4d");
diff --git a/panda/src/putil/paramValue.cxx b/panda/src/putil/paramValue.cxx
index 5ffcf2807c..88add8a9c0 100644
--- a/panda/src/putil/paramValue.cxx
+++ b/panda/src/putil/paramValue.cxx
@@ -16,6 +16,7 @@
 
 template class ParamValue<std::string>;
 template class ParamValue<std::wstring>;
+template class ParamValue<vector_uchar>;
 
 template class ParamValue<LVecBase2d>;
 template class ParamValue<LVecBase2f>;
diff --git a/panda/src/putil/paramValue.h b/panda/src/putil/paramValue.h
index f7e4f207a1..f98e76d3f1 100644
--- a/panda/src/putil/paramValue.h
+++ b/panda/src/putil/paramValue.h
@@ -22,6 +22,7 @@
 #include "bamReader.h"
 #include "bamWriter.h"
 #include "luse.h"
+#include "vector_uchar.h"
 
 /**
  * A non-template base class of ParamValue (below), which serves mainly to
@@ -152,6 +153,7 @@ private:
 
 EXPORT_TEMPLATE_CLASS(EXPCL_PANDA_PUTIL, EXPTP_PANDA_PUTIL, ParamValue<std::string>);
 EXPORT_TEMPLATE_CLASS(EXPCL_PANDA_PUTIL, EXPTP_PANDA_PUTIL, ParamValue<std::wstring>);
+EXPORT_TEMPLATE_CLASS(EXPCL_PANDA_PUTIL, EXPTP_PANDA_PUTIL, ParamValue<vector_uchar>);
 
 EXPORT_TEMPLATE_CLASS(EXPCL_PANDA_PUTIL, EXPTP_PANDA_PUTIL, ParamValue<LVecBase2d>);
 EXPORT_TEMPLATE_CLASS(EXPCL_PANDA_PUTIL, EXPTP_PANDA_PUTIL, ParamValue<LVecBase2f>);
@@ -173,6 +175,7 @@ EXPORT_TEMPLATE_CLASS(EXPCL_PANDA_PUTIL, EXPTP_PANDA_PUTIL, ParamValue<LMatrix4f
 
 typedef ParamValue<std::string> ParamString;
 typedef ParamValue<std::wstring> ParamWstring;
+typedef ParamValue<vector_uchar> ParamBytes;
 
 typedef ParamValue<LVecBase2d> ParamVecBase2d;
 typedef ParamValue<LVecBase2f> ParamVecBase2f;