Mammothman is a mammoth chojin who appeared as a member of Kinnikuman Super Phoenix's team during the final story arc of the manga. His trademark was extending tusks that seemed to have a mind of their own, and would seek out and consume any exposed blood nearby.
He reappears in Kinnikuman Nisei disguised as the teddy bear Michael, teaming up with Warsman as his tag team partner to form the "Hell's Bears". His identity was hinted at when Neptuneman tasted and recognised the ice that fell out of Michael's costume.
Mammothman first appeared at Kinnikuman's coronation, where he prevented Kinnikuman from attacking Super Phoenix, his master. In the first round of the tournament, he quickly showed his power by slaughtering Kinnikuman Big Body's entire team, but tied on purpose with Cannonballer to allow Super Phoenix to be the one to fight Big Body. Mammothman next saw action in the six-man match between team Super Phoenix and Team Soldier.
In a clash of titans he singled out Buffaloman and the two eventually engaged in a battle of possession of Soldier's Muscle Prophecy page. Buffaloman eventually took him out with a Buffalo Bomb but soon after fell to his death into the canyon below. When Mammothman regained consciousness he took the page and threw it into a torch, causing Soldier to begin disappearing. Later, after learning of Warsman's training to defeat the Big Tusks, Mammothman ambushed Warsman forcing him to drop out of the finals.
Mammothman's final battle was in another six-man match against Kinnikuman, Neptuneman (disguised as The Samurai) and Robin Mask. For the most part, Mammothman fought Robin, doing a number on the hero with his blood-seeking tusks. To make the fight "more interesting," Super Phoenix started to burn the pages of both of the chojin from the Muscle Prophecy book.
The pages' destruction was akin to the chojin never having existed. Robin, master strategist as always, deduced the weakness of the tusks and spilled blood onto Mammothman himself. His tusks turned against him and impaled Mammothman. Robin defeated Mammothman with a Rope Work Tower Bridge. Both, however, disappeared with the immolation of their prophecy book pages, Mammothman crying his hatred for everyone assembled.
Mammothman appears as 21st century Warsman's mysterious partner Michael.
A battle royale is announced.  They spend a part of the match fighting against the Hell's Carpenters, before turning their attentions against Moaidon.  The Jungle Books then attack the Hell's Bears, once the Celebrities are disqualified from the match. 
They throw the Hell's Bears at one another, but the Hell's Bears lock arms and counter with kicks to their opponents' faces. Hell's Bear #2 takes Savannah into a Bear Hug, while Hell's Bear #1 clutches Gori Max's and falls upside-down with him.  Hell's Bear #2 flips himself and Savannah into a sub-ring, and it is then noticed Gori Max is still descending downward, but now he is directly over Savannah's head. 
Their heads collide, which knocks them unconscious, and they are then dragged from the ring.  The Hell's Bears then attack Illusions by biting them, but are subjected to a devastating counter.  Later, they head into the sub-ring to attack Neptuneman and protect Mantaro Kinniku, but Neptuneman then knocks them both out of the ring. 
They win the battle royale is won by default, as all other teams are eliminated, and - in the match-up event - are placed against Team Cosmos in the first round.  During the event, the Hell's Bears are attacked by Meteoman, which tears Belmond's costume and rips off his eye in the process.  The snow that fell out of his costume clues the 21st century Neptuneman in on his identity. 
The B-Block first-round match between them takes place at Kanagawa's Kawasaki Stadium.  Team Cosmos arrives with capes adorned with the USSR insignia, while the Hell's Bears enter to a fairy-tail parade on a sleigh.  The Hell's Bears dance onto the ring in costumes, before coaxing Team Cosmos to dance with them, but this angers Team Cosmos into a Galactica Attack.  The bell is then rung, while Team Cosmos lament that the bear costumes feel like a mockery of their homeland's Misha mascot. Team Cosmos then use a Russian Sickle. 
Meteoman uses a Meteor Cannon against Belmond.  This knocks Belmond back into his corner, while Sputnik uses a No. 1 Cosmos Medallion, and together Team Cosmos launch a rocket into the graveyard orbit above Earth. Belmond then kicks at Meteoman's jaw, while Michael throws Sputnik against the mat.  Meteoman attempts an A-Bomb, which Belmond cancels with Head Scissors.  While Belmond unleashes a series of attacks on Meteoman, Michael is attacked by Spuntnik, and Sputnik throws him with a double-arm suplex, which causes him to land near to Belmond. 
Belmond uses a rolling sobat on Sputnik, as he switches places with Michael, but Meteoman uses another Meteor Cannon into Belmond's legs. Team Cosmos then use a Siberian Storm. This rips open Belmond's back and causes immense bleeding, and - as Sputnik holds him upright - Meteoman kicks continuously at his open wound. Eventually, Belmond uses a Bear Claw as a counter-attack.  Belmond then delivers a series of elbow drops to Sputnik's head.  Team Cosmos use Sputnik's antenna to pull a rain of space debris down against the Hell's Bears, and the light of which illuminates Belmond's cybernetic body. 
Meteoman uses another Meteor Cannon, which is counter by Michael.  Belmond breaks off Sputnik's antennas, preventing him from summoning more space debris, and then puts him in a bear-hug, before Michael grabs Meteoman and together they perform a Teddy Crash. This knocks Sputnik and Meteoman down for the count, but Sputnikman stands again and confronts Belmond about his true identity. Belmond proceeds to drill a hole through his body, revealing his identity as Warsman. 
This defeats Team Cosmos and kills Sputnikman. 
During their fight against the Hell Expansions, Neptuneman and Seiuchin, his identity is finally revealed and he goes head to head with the Perfect Chojin Seiuchin. When Seiuchin is brought back to his senses, both Neptuneman and Mammothman betray their partners, when Warsman had just defeated Seiuchin, and team up in the middle of the match. They knock off Seiuchin's face with an Optical Fibre Cross Bomber, then they defeat Warsman.
Before the semi-finals begin, Satan appears in the sky, and Neptuneman and Mammothman reveal their allegiance with The Five Disasters Thunder and Lightning, throwing a hell-spawned spider at Kinnikuman, which enters his body and forms into an hourglass.
The Nova Hell Expansions attack the Five Disasters with elbow drops, as they try to enter the ring.  They continuously strike their backs like a drum, until Lightning tries to counter and is thrown onto the ring in Tournament Mountain, followed by Thunder being blown into the ring by Mammothman's Ear Gust. The Nova Hell Expansions land on the ring, where Neptuneman throws his cape of faces onto the ceiling. The sides of the War-Cube are replaced by walls covered in swords. 
Neptuneman begins the match with a Cross Bomber against Lightning.  Lightning catches himself on the ropes, and counters an oncoming Quarrel Bomber with a kick to the back of Neptuneman's head. The gong is then officially rung. Mammothman and Thunder collide, shaking the ground. Thunder then uses a Lion Finger to break the top rope of the ring, but Mammothman uses a Branch Tusk to prevent him cutting the second, and proceeds to throw Thunder onto the swords that litter the floor. 
Thunder manages to stand and Mammothman uses another Big Tusk.  Thunder uses a Lion Mane to break the branching tusks, before he flies back into the ring, and attacks Mammothman, sending blood hurtling down into the crowds. He follows with a body-press, and Lightning lands on top of him, which sends the swords - still in his body - penetrating into Mammothman. Neptuneman and Lightning tag into the match, trading places with Mammothman and Lightning. 
They exchange a series of blows, until Lightning gains an advantage and breaks Neptuneman's left arm.  Just as the Nova Hell Expansions attempt an Optical Fibre Cross Bomber in response, Lightning uses his power of Acceleration to escape.  Lightning then uses a Double Neck Cut.  He escapes another attempt an Optical Fibre Cross Bomber, by forcing them to curve the optical fibres.  The Five Disasters then slam both of the Hell Expansions into the ring, and follow with Acceleration to toss both of the Hell Expansions onto the swords outside of the ring. 
The Nova Hell Expansions stand again, and Neptuneman uses an Ignition Crash on the Five Disasters.  Neptuneman attempts a Quarrel Press, but misses, and follows with a Chojin Hanging on Lightning. This is follows by Mammothman's Nose Freezing.  Due to physics, this stops their Acceleration from working and thus is cannot be used.  Mammothman uses his Big Tusk, and follows with a McKinley Avalanche against both of the Five Disasters; at this point, a voice calls to Mammothman and tells him to watch out for Thunder's Lion Mane attack behind him. He dodges and uses an Ice Rock Gyro. 
The Ice Rock Gyro on Thunder knocks Lightning also out of the ring.  The Five Disasters use the blood outside the ring to stick the boards of swords to their feet, which - on returning to the ring - use to kick at Mammothman, whose voice warned him on a trick. The voice continues to advise Mammothman, who uses his Nose Fencing against the Five Disasters, but they counter with a Nose Cleaving Leg Lariat. 
Mammothman tries another Nose Freezing.  He then uses a Jumbo Nose Catch on Thunder, before using another Ice Rock Gyro, but Thunder breaks out with a Lion Finger, and then uses a Lion Strike. The Five Disasters then use a Disaster Drive on Mammothman.  The Five Disasters then use their exotic matter to revert Mount Fuji to the state of an active volcano, which causes debris and boulders from the eruption to rain down on the Nova Hell Expansion. 
Mammothman uses his nose to block further debris from striking Neptuneman.  Two rocks strike his legs, which knock him down onto the canvas. This is followed by a Hot Rock Gyro from Lightning, and then the Five Disasters team up for a Giant Beat Cremation.  The Five Disasters continue to use tag-team moves on Mammothman, as he rises during the countdown.  Neptuneman uses his Magnet Power Comeback to stop another Giant Beat Cremation.  He follows with a Quarrel Sword Bomber, while the Five Disasters return to using their Acceleration, but this is stopped short by another Quarrel Sword Bomber. 
Neptuneman criticises the Five Disaster, as - even though they are all Evil Chojin - he cannot support their lawless nature and breaking of rules, and he goes to Mammothman's defence. The Five Disasters try to use their Death Watch Branding on Mammothman, but Neptuneman stops them with an Iron Bat Squeeze.  Mammothman confronts Neptuneman, as his actions go against the teachings of a Perfect Chojin, in that they should not help anyone (not even a team member).  He uses a Blind Alley Ear against Thunder.
Mammothman eats the volcanic debris, which helps increase his magnetic power, and - with Neptuneman - engages in a Cross Bomber Resurrection.  The attack knocks off a piece of Thunder's mask.  It fails to rip off Thunder's mask or face, as it is revealed Mammothman purposely failed the attack in order to destroy Neptuneman's arm, as he seeks to maintain the Perfect Chojin teachings, even if Neptuneman does not. 
Thunder then takes out Neptuneman's Achilles heel, and a Lion Comb down Neptuneman's back.  A Lion Fan takes out Neptuneman's other arm.  Lightning uses his Boiling Sickle to knock the studs off from Neptuneman's shirt, which attach to his own costume, and then uses a Double Leg Suplex, which cracks off Neptuneman's mask. Mammothman forfeits the game and leaves the ring.  Neptuneman finally realises the meaning of Friendship Power, but the Five Disasters use a Perfect Decay Finale on him. 
Big Tusks (ビッグ・タスク)
- Mammothman's versatile tusks either jut out to pierce, grow more protrusions or home in on his enemies by sensing their blood, which Robin Mask used to his advantage in their match.
Powerful Nose Breaker (パワフル・ノーズブリーカー)
- Using his trunk he lifts his prey up in the air, then places his knee out and performs a devastating back-breaker on them.
Nose Fencing (ノーズフェンシング)
- His trunk elongates and becomes pointed at the end, he uses this to impale his opponents.
Ghost Canvas (ゴーストキャンバス)
- He slams his opponent's head into the canvas so it is stuck, then twists the body until the head snaps off.
Ice Rock Gyro (アイス・ロック・ジャイロ)
- He lifts up his opponent with his trunks and throw him/her into the air. While in mid-air, the opponent starts to get whipped by Mammothman's trunk. The opponent start to freeze into a solid block of ice every time he/she gets hit.
Chojin Decoration Tree (超人デコレーションツリー)
- A combination move with Prisman and Super Phoenix. Mammoth man throws the opponent into the air facing upwards. Prisman catches the opponent in a triangle choke hold while Super Phoenix applies a figure four leg lock at the same time. The opponent then falls onto Mammothman's shoulders and he applies an Argentine Back-Breaker hold as well.
- Team Super Phoenix: Advance Guard (First Round)→ Second Guard (Semifinals)→ Second-in-Command (Finals)
- Chōjin Hunter
- Chōjin Destroyer
- Intelligence Chōjin
- Immortal Body
- Win/Loss Record
- O Pinchman (Powerful Nose Breaker)
- O Leopardon (Nose Fencing)
- O Golemman (Ghost Canvas)
- Δ Cannonballer (Double KO)
- X Buffaloman (Buffalo Bomb)
- O Warsman (Big Tusks)
- Δ Robin Mask (Rope Work Tower Bridge→ Double KO)
Win/Loss Record (Tag)
- O Team Cosmos (Teddy Crusher)
|Strong the Budo|
|Perfect Large Numbers|
|Max Radial, Turboman, Crushman, Dalmatiman, Marlinman , Peek-a-Boo|
|New Perfect Large Numbers|
|Marvellous, Jak Chi, Nemesis, Polarman|
|Mirageman, Abyssman, Painman, Psychoman, Ganman, Thingman, Crowman, Justiceman, Goldman, Silverman, The Man|
|Qilinman, Screw Kid, Kendaman, Neptuneman, Big the Budo, Omegaman Dexia, Mammothman, Seiuchin|