As of July 2026, ThunderCats Season 1 aired in 1985 with 65 episodes — streaming now on Hulu. Full episode guide and where to watch below.

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ThunderCats Season 1

1985 65 Episodes Animation · Sci-Fi & Fantasy ⭐ 8/10

If you want science fiction that respects its own premise, ThunderCats Season 1 is available on right now. Across 1 season, the show has had time to find its rhythm and keep it. 1,103 viewers have already rated it on TMDB — the kind of consensus that does not happen by accident. Larry Kenney's performance is the anchor the more ambitious scenes need. Put it on tonight and see for yourself.

ThunderCats Season 1 arrived without much fanfare and built its audience the hard way — through word of mouth. What makes ThunderCats Season 1 work is that the ideas never crowd out the people having them. Season 1 of ThunderCats includes 65 episodes. It aired from January 1985 to December 1985. This season stars Larry Kenney, Peter Newman and Earle Hyman. Larry Kenney and Peter Newman lead a cast that brings real weight to the material. It was aired in 1985. The rules of ThunderCats Season 1's world are consistent enough that the big swings never feel like cheating. It rarely drops the ball, and when it does, it recovers fast.

Viewers burned by ambitious sci-fi that could not sustain its premise should give ThunderCats Season 1 a chance. If you have run out of similar titles to watch, this is a strong next pick. The complete run is available and best experienced without too much prior knowledge of where it goes. Larry Kenney anchors it with a performance that makes the more abstract moments feel personal. If you have been burned by ambitious sci-fi before, this is the exception.

📡 Where to Watch ThunderCats Season 1

🇺🇸 United States

🎬 ThunderCats Season 1 — Episode Guide

With their home planet, Thundera, about to explode, the Thunderians flee to a distant galaxy. Before they can make the long journey the Mutants sweep in and destroy most of the fleet in an attempt to capture the Eye of Thundera. Due to the attack, the Thundercats find themselves on a distant planet....

The Unholy Alliance

The Mutants, who have also reached Third Earth, encounter an old pyramid. It turns out to be the home of Mumm-Ra the Ever-Living, and they join forces to capture the Sword of Omens. Both the Mutants and Mumm-Ra attempt to attack Lion-O to possess the Sword, but miserably fail.

The Ro-Bear Berbils are a friendly group of robot bears that live on Third Earth. Lion-O and Snarf don't know this, and end up getting caught in a Ro-Bear trap. The Berbils free them however, and they form an alliance. Mumm-ra attacks the Berbil village, but the Thundercats save it. In return, the R...

The Slaves of Castle Plun-Darr

The homeless Mutants also make plans to build their home. They enslave a primitive race of beings called Brute-Men to do their work for them. The Thundercats go to Castle Plunn-Darr to free the Brute-Men from the Mutants.

Mumm-Ra uses his shapeshifting abilities to pass himself off as a Thunderian so he can stage the "rescue" of Cheetara and infiltrate Cats' Lair.

The Terror of Hammerhand

When Snarf and a young unicorn are captured by the pirate Hammerhand and his crew of Berserkers, Lion-O goes to rescue them.

Trouble with Time

With their supply of Thundrillium running low, the Thundercats set off in search of a fresh supply. Tygra detects a large deposit in a cave and goes to investigate - unfortunately, he has entered the Cave of Time and anyone who ventures in there will age rapidly until they die. His only hope is that...

The Tower of Traps

Wilykit and Wilykat try to stop a band of living gargoyles from robbing a Wollo but fail to do so and trail the gargoyles to a nearby Tower. Wilykat is trying force the door open when he suddenly disappears, leaving Wilykit - who was looking for another way in - close to panic. She and Lion-O (alert...

The Garden of Delights

While investigating an earthquake, Tygra stumbles across the Garden of Delights and meets a talking plant named Silky, who offers him her fruit. But it turns out that "Silky" is another of Mumm-Ra's disguises and eating the fruit seems to have affected Tygra's mind.

Mandora: the Evil Chaser

Lion-O and Snarf stumble upon a portable jail cell, and mistakenly open it up. Three of the galaxy's worst villains escape. One of them, a slick thief, manages to steal Lion-O's sword. Lion-O helps Mandora, the inter-stellar police officer that imprisoned the villains, recapture them, and return the...

The Ghost Warrior

Two Bolkins (sheep-like beings from Third Earth) unleash the ghost of Grune the Destroyer, a renegade Thundercat who once terrorised Third Earth and now turns his attention to the Thundercats.

Mumm-Ra and the Mutants plot to open the Time Warp Prison and release the evil Princess Ta-She in order to use her deadly Doomgaze against the Thundercats.

Lord of the Snows

When a meteorite made of pure Thundrillium crashes on Hook Mountain, the Thundercats decide to use it to replenish their depleted energy supply. But Lion-O must first gain the trust of the fierce Snowman.

The Spaceship Beneath the Sands

Tired of constantly being bested by the Thundercats, the Mutants have Mumm-Ra raise their spaceship and salvage their vehicles.

The Time Capsule

Lion-O becomes homesick, and his memories of Thundera are almost nonexistent. Jaga appears to Lion-O and tells him that on their spaceship, they brought with them a time capsule which contained a recording of Thundera and its history up to the time it was destroyed. The Thundercats set out to search...

The Fireballs of Plun-Darr

The Mutants, once again searching for a way to destroy the Thundercats, recover some more items from their spaceship. They take their ship's engine and convert it into a giant fireball-shooting machine. The mutants terrorize Third Earth with their fireballs, until the Thundercats go to castle Plunn-...

All That Glitters

Mumm-Ra tricks Lion-O into using the Sword of Omens against Tygra, causing the blade to break in half and lose its powers. The only way Lion-O can restore the Sword is to venture into a volcano and have the Inflamer reforge it. But the Inflamer requires a payment of gold... Has Lion-O taken on more ...

Mumm-Ra creates device that can make Panthro clones. He embeds the spirit of Hammerhand into his clone and sets it free to destroy Third Earth. The Third Earth inhabitants blame the Thundercats for the terror because they think its the real Panthro destroying their villages and burning their crops. ...

Wilykit and Kat accidentally free an ancient monster that was banished to an old shrine centuries ago. The evil monster, Mongor, begins to destroy the planet, and is much stronger than the Thundercats. He captures all the elder Thundercats with his powers. Wilykit and Kat return to the shrine to fin...

Return to Thundera

The Thundercats briefly show Lion-O how the time capsule they recovered from the caveman works. Curious to see more, Lion-O activates it during his night-time watch, and gets caught in its projection rays. The rays send him back in time to Thundera, just before the final tremor that destroyed the pl...

🎭 Cast of ThunderCats Season 1

Larry Kenney

Lion-O / Jackalman (voice)

Peter Newman

Tygra / WilyKat / Monkian (voice)

Earle Hyman

Panthro (voice)

Lynne Lipton

Cheetara / WilyKit (voice)

Earl Hammond

Mumm-Ra / Jaga / Vultureman (voice)

Bob McFadden

Snarf / Slithe (voice)

📋 All Seasons of ThunderCats

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