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Lord Astrotrain, what about me?
~ Jero pleading for his life on Astrotrain

Jero is a minor villain from G1 Transformers. He is a religious alien high priest, astrologer & a fanatic who enslaves the planet Titan, one of the moons of Saturn, with an abusive pagan religion & worships "Sky Gods". He appeared in the episode "The God Gambit".

G1 Transformers

Jero ruled the planet Titan with an abusive pagan religion. He enslaves its people to pay high taxes & harvest offerings to the feet of the "Sky Gods". Talaria, a female rebel leader, leads a revolt against his harsh rule by urging her fellow Titans to revolt, shatters the Sky Gods' statue & exposes Jero for using the gods as an excuse for "high taxes & harsh laws". She soon have him & the other priests tied up, while she led the other Titans to a distant place away from the temple.

However, Jero was soon freed along with his fellow priests when the Autobot Cosmos, who was involved in a fight with Decepticons Starscream, Thrust & Astrotrain, crashed into the planet. He uses Cosmos' "descending" as an excuse to regain power while Talaria tries to stop her fellow Titans from believing him. The Decepticons then landed on the planet & discovers this. Starscream tried to took this as an opportunity to become leader but Astrotrain refrains him, suggesting he should pretend to be the Titans' supreme god instead to enslave them. Jero & the other Titans mistook the Decepticons as "Sky Gods" & began worshipping them, with Astrotrain as their "Supreme God". He believed them, became his high priest & followed most of Astrotrain's orders such as turning an unconscious Cosmos into the temple's new idol & forcing Titans to worship the Decepticon transporter & give him offerings.

He soon introduced Astrotrain to a cave full of energy-rich crystals. Astrotrain took fond of the crystals & decided to use it as a new source of energy for the Decepticon cause. He appointed Jero as the overseer of the mine, who then enslaves the Titans to bring the crystals back to the temple.

Later, Jero tries to sacrifice Talaria, who was helping the Autobots free the "idol" Cosmos, to Astrotrain, believing her as a heretic & the Autobots as "Evil Gods". Before he could ever do so, Jazz rescued her & holds off the Decepticons, as well as Jero & his followers before Perceptor & Omega Supreme arrived. Knowing they are no match for the colossal Autobot, Astrotrain shoots the crystals which causes a chain reaction which started to destroy the island where the temple is located. Jero tried to join the Decepticons in escaping the temple, believing he would be spared from the destruction. Astrotrain then pushes him out of the way & abandons him to die in the temple.


Transformers Villains

Generation One
Decepticons
Megatron | Starscream | Soundwave | Ravage | Laserbeak | Ratbat | Frenzy | Rumble |Thundercracker | Skywarp | Shockwave | Reflector | Thrust | Ramjet | Dirge | Devastator/Constructicons (Long Haul | Bonecrusher | Scrapper | Mixmaster | Scavenger | Hook) | Bruticus Maximus/Combaticons(Brawl | Vortex | Blast Off | Swindle | Onslaught) | Menasor/Stunticons(Breakdown | Drag Strip| Wildrider | Dead End | Motormaster) | Insecticons (Shrapnel | Bombshell | Kickback) Acid Storm | Sunstorm | Galvatron | Cyclonus | Scourge | Sweeps | Predacons/Predaking (Razorclaw | Rampage | Divebomb | Tantrum | Headstrong) | Terrorcons/Abominus (Hun-Gurr | Blot | Cutthroat | Rippersnapper | Sinnertwin) | Runabout & Runamuck | Trypticon | Scorponok | Weirdwolf | Skullcruncher | Mindwipe
Others
Unicron | Quintessons | Doctor Arkeville | Shawn Berger | Lord Chumley | King Nergill | Ali | Nightbird | Jero | Old Snake | Primacron | Tornedron | Dweller | Mark Morgan | Gregory Swofford

Generation Two
Decepticons
Megatron | Starscream | Soundwave | Bludgeon | Onslaught | Swindle | Blast Off
Cybertronian Empire
Liege Maximo | Jhiaxus | Rook | Mindset
Others
Swarm

Beast Wars/Beast Machines
Predacons/Vehicons
Megatron | Scorponok | Waspinator | Blackarachnia | Terrorsaur | Tarantulas | Inferno | Dinobot II | Tankor | Strika | Obsidian | Thrust

Unicron Trilogy
Decepticons
Megatron | Starscream | Thundercracker | Thunderblast
Others
Unicron | Sideways | Nemesis Prime

Animated
Decepticons
Megatron | Starscream | Lugnut | Slipstream | Lockdown
Others
Nanosec | Slo-Mo