"From beyond any known galaxy, bringing with them the laws and ideals of their doomed planet, come the Thundercats. These brave and courageous cat-like humanoids carry with them the powerful Sword of Omens, which contains the mysterious Eye of Thundera- the source of power for all the Thundercats. But there's also a treacherous band of hideous mutants from the planet Plundar who want the sword. Crash landing on Earth, the Thundercats battle these evil creatures who are aided by the supernatural powers of the deadly and mysterious Mum-Ra. Contains Episodes: #1-5 Exodus The Unholy Alliance Berbils The Slaves of Castle Plun-Darr Pumm-ra"

the entire season 1 is out very soon too though Warner home video.

"Feel the magic! Hear the roar! Join the powerful Thundercats as they battle the evil forces of Mumm-Ra and his servants of doom. Lion-O, the young but courageous leader, wards off evil attackers with the help of the mighty Sword of Omens, which holds the mystical Eye of ThunDera jewel...the source of the Thundercats' power! Lion-O, Panthro, Cheetara, Tygra, WilyKat, Wilykit, Snarf and the spirit of Jaga join Lord Lion-O at Cats' Lair, protecting Third Earth from Mumm-Ra and his mutants from Castle Plun-Darr!

This beloved Rankin-Bass animated series from 1985 is coming home to DVD very soon, according to Warner Home Video. A 3-disc set called Thundercats - Season 1, Volume 1 is expected to arrive in the May/June timeframe. An exact date has yet to be announced. Stay tuned, and we'll bring you details and cover art just as soon as we can!"
- TVshowsondvd.com