Season
Season 4 Episode
- Season 1 Exodus
- Season 1 The Unholy Alliance
- Season 1 Berbils
- Season 1 The Slaves of Castle Plun-Darr
- Season 1 Pumm-Ra
- Season 1 The Terror of Hammerhand
- Season 1 Trouble with Time
- Season 1 The Tower of Traps
- Season 1 The Garden of Delights
- Season 1 Mandora: the Evil Chaser
- Season 1 The Ghost Warrior
- Season 1 The Doomgaze
- Season 1 Lord of the Snows
- Season 1 The Spaceship Beneath the Sands
- Season 1 The Time Capsule
- Season 1 The Fireballs of Plun-Darr
- Season 1 All That Glitters
- Season 1 Spitting Image
- Season 1 Mongor
- Season 1 Return to Thundera
- Season 1 Dr. Dometone
- Season 1 The Astral Prison
- Season 1 The Crystal Queen
- Season 1 Safari Joe
- Season 1 Snarf Takes Up the Challenge
- Season 1 Sixth Sense
- Season 1 The Thunder-Cutter
- Season 1 The Wolfrat
- Season 1 Feliner (1)
- Season 1 Feliner (2)
- Season 1 Mandora and the Pirates
- Season 1 Return of the Driller
- Season 1 Dimension Doom
- Season 1 Queen of 8 Legs
- Season 1 Sword in a Hole
- Season 1 The Evil Harp of Charr-Nin
- Season 1 Lion-O's Anointment First Day: Trial of Strength
- Season 1 The Demolisher
- Season 1 Monkian's Bargain
- Season 1 Tight Squeeze
- Season 1 The Micrits
- Season 1 Lion-O's Anointment Second Day: The Trial of Speed
- Season 1 The Rock Giant
- Season 1 Jackalman's Rebellion
- Season 1 Turmagar the Tuska
- Season 1 Lion-O's Anointment Third Day: Trial of Cunning
- Season 1 The Mumm-Ra Berbil
- Season 1 Mechanical Plague
- Season 1 Trapped
- Season 1 Lion-O's Anointment Fourth Day: The Trial of Mind Power
- Season 1 Excalibur
- Season 1 Secret of the Ice King
- Season 1 Good and Ugly
- Season 1 The Transfer
- Season 1 Divide and Conquer
- Season 1 Dream Master
- Season 1 Out of Sight
- Season 1 The Mountain
- Season 1 The Superpower Potion
- Season 1 Eye of the Beholder
- Season 1 Lion-O's Anointment Final Day: The Trial of Evil
- Season 1 The Trouble with ThunderKittens
- Season 1 Mumm-Rana
- Season 1 The Shifter
- Season 1 Fond Memories
ThunderCats - Season 1 Episode 20 Return to Thundera
8.25 22 minutes 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 planet. Meanwhile, the Mutants have built an evil robot monster that is destroying Cats' Lair. Back on Thundera, Lion-O encounters his father, Claudus, and saves him from a Mutant attack. In return, Claudus gives Lion-O the plans to the robot that was attacking the Thundercats in his own time.
