Zeus: Now this is truly Olympus! Surely it can be no other place. There's beautiful Demeter, goddess of the harvest! And double-faced Janus, lord of beginnings and endings! And merry Hermes, the trickster of the gods! Now, at last, mighty Zeus is home!
Zeus: Like the shadow of ebon-winged night, he rises from the dark realm. Behold, the coming of my brother, Lord Hades!
Zeus: Be gone, Lord Hades! Get thee back to thy own realm. Do not come again to Olympus until bidden!
Batman: I think I get the message...
At the end of the episode Zeus recognises Two-Face as Janus. However, Janus is a figure in Roman mythology, not Greek as Zeus and the other mythological figures he mentions throughout the episode.