Fireball XL5 (1962)

S1E12 The Last of the Zanadus

After a decade in space, Major Jim Ireland comes back to Earth, but he harbors a secret. Unbeknownst to those around him, he has allied himself with Kudos, the sole survivor from the planet Zanadu. Kudos is driven by a fierce desire for vengeance against the Lazoones, who obliterated his civilization.