Thunder Killer

Thunder Killer (サンダーキラー) is a Kaiju from Ultraman Geed. It is made by combining Eleking and Ace Killer.

Subtitle: Belial Fusion Monster (ベリアル融合獣)

Stats

 * Height: 53 m
 * Weight: 52,000 t
 * Origin: Area S of Himuro

Ultraman Geed
Thunder Killer first appeared at the end of episode 5 of Ultraman Geed where he was formed when Kei Fukuide used his Riser to turn into this monster via the Kaiju Capsules of Eleking and Ace Killer. The monster spent his time rampaging throughout the city and destroying property with his Light Blades, was met with opposition by Ultraman Geed, and the two of them immediately charged at each other.

As the two giants raged on, they were initially evenly matched, but Geed hurt his hands after he tried to hit Thunder Killer on the head, leading to the latter to strike at the former hard with his electrified talons. Afterwards, Geed transformed into his Solid Burning form in hopes of turning the tide in his favor, and he did so by attaching the Geed Slugger to his arm after Thunder Killer deflected his Psychic Slugger, but when Geed fired his Strike Boost, Thunder Killer absorbed the attack and fired it right back at him. Just when things were looking bad for Geed, Ultraman Zero appeared to give him a helping hand, only for the fusion kaiju to vanish.

Eventually, Thunder Killer returned in Area J of Unno and so did Geed who showed up for a rematch. Their rematch started after the fusion kaiju taunted the Ultra, which proved to be a big mistake for the former as the latter learned from their last fight and held the upper hand over Thunder Killer via combat until the kaiju fought back and landed a reversed Thunder Discharge on him, knocking him down, and making his Color Timer go off. Riku Asakura then remembered some inspiring words said by Leito Igaguri about fate and caring about others, got back up, and for the first time, summoned his Geed Claw. With it, he landed a Claw Cutting attack on Thunder Killer then transformed into his Acro Smasher form as he dodged and deflected Light Blades with relative ease. After getting in four devastating slashes on the fusion kaiju, Geed destroyed him once and for all with his Diffusion Shower.

Trivia

 * Suit Actor: Kazunori Yokoo
 * Paralleling Orb and Geed's similarity in their usage of past Ultras' powers, the similarities of Thunder Killer's components are as follows:
 * Both are Ultra Kaiju that was revived sometime later into another variant (Eleking was revived into Re-Eleking while Ace Killer was revived into Mebius Killer).
 * Additionally, some of their upgraded forms/variants have no aesthetic changes (eg; Re-Eleking, Eleking III, Mebius Killer, Victory Killer).
 * Prior to the conception of this fusion, Victory Killer (an upgraded variant of Ace Killer) is capable of turning its right arm into Eleking Tail due to using data on Ultraman Victory's Ultrans.
 * Both have alternate forms that never seen official on-screen appearances besides games and toylines, EX Eleking and Kabuto the Killer.
 * Compared to most Belial Fusion Monsters, Thunder Killer appears to be a variant of Eleking whereas its name is a variant of Ace Killer.
 * Due to Ace Killer being a robot and Eleking being a living organism, Thunder Killer is technically a cyborg.
 * Thunder Killer taunts Geed similar to how Juggler (as Zeppandon) did to Orb. He did a "Bring it" hand gesture.

Transformation
After scanning both capsules, Kei presses the trigger of the Riser and transforms into "Ultraman Belial". As the background changes to an eclipse, Kaiju Capsules of Eleking and Ace Killer appear briefly before "Belial" inhales them, morphing into and creating Thunder Killer.

Powers and Weapons

 * Light Blade (光刃): As part of Eleking's normal attacks, Thunder Killer can launch red crescent-shaped (In Ultraman Fusion Fight!, it is blue or yellow instead), electric disc wave bursts of electric energy fired from his mouth.
 * Thunder Discharge (サンダーデスチャージ): Thunder Killer whips the target with its electrified tail, followed by slashing them with its electrified claw. This attack is seemingly strong enough to caused Geed's color timer blinks.
 * Talons : Inherited from Ace Killer, Thunder Killer's left hand is also armed with talons over his fingers.
 * Deflection : Thunder Killer's claws can be used to deflect attacks.
 * Absorption : Through Ace Killer's power, Thunder Killer can absorb and redirect beams. The energies first absorbed through the Color Timer, storing through its shoulder spikes before redirecting the attack via its mouth.