Infinity Trister, known as Tristar (トリスター, Torisutā?) in the anime, is a Gundalian Bakugan and Marucho's Guardian Bakugan in Bakugan: Mechtanium Surge. He is Marucho's fifth Guardian Bakugan after Preyas, Angelo/Diablo Preyas, Minx Elfin, and Akwimos. His BakuNano is Crosstriker and his Mechtogan is Accelerak.
Agile and fluid in his movements, Infinity Trister combines speed with the mystery of his stealth mode to confuse opponents. Extra powers unique to Infinity Trister provide a defense shield which nullifies his opponent's ability in battle.
In Interspace Showdown, he was revealed to be Marucho's Guardian Bakugan in the intro and that he is a Gundalian Bakugan that teamed up with Marucho shortly after the events of Gundalian Invaders. He later helped the children in the arena that Titanium Dragonoid was battling in due to him not controlling his new powers by protecting them when the buildings were collapsing alongside Taylean.
In Mechtogan Mayhem, He is shown arguing with Taylean and Dan saying he should battle while Dan sits out. Before Marucho and Jack Punt began to battle he gets cocky saying they will win easily. he later battled Krakenoid in a jungle like environment. Krakenoid starts off by using fish flop turning invisible and submerging him in water. He then uses Aquos Mine and turns Krakenoid visible. His opponent attacks him with his claw though. Krakenoid then cloned himself and attacked him brutally. Marucho then opened up heptagon mixer causing his power to increase. He then used Abyss Cyclone to attack. However, the battle was interrupted by Zenthon before he could defeat him. He later attempted to battle Zenthon by using fear stream on the robot which caused no damage. He then used hyper stream which proved useless. He was then defeated in one strike. The battle resulted in a draw.
In Tri-Twister Take Down, he and Taylean were battling against the Tri-Twisters and their Cyclone Percivals but were losing since it was three against two. They were later saved by Krowll and Horridian.
In Agony of Defeat, he and Taylean briefly fought against Drago using Core Bunker and Root Core - Battle Bastion to protect Bolcanon and Krakenoid from Thor Buster. They then noticed Drago was acting like a savage.
In BakuNano Explosion, he battled the Bash Brothers and their Darkus and Pyrus Flash Ingrams and won a bit. Marucho (possibly) used Hold Over to prevent the Bash Brothers from moving and using any abilities until the battle's over, but he and Tristar lost due to them using their BakuNanos causing Shun and Taylean to beat them in their place.
He appeared again in Back In Sync. He talked about how he arrived in Bakugan Interspace a long time ago, probably during Gundalian Invaders, and was looking for his destined partner. He met many Brawlers but he felt that they were not for him and if it took him years, he would wait. Then, when he saw Marucho battling, he had realized that Marucho was to be his destined partner. He battled again with Marucho against Krakenoid and Jack Punt. Even though Krakenoid used his BakuNano, Jamsaber, Tristar defeated him.
In Mind Search, he, along with Marucho had decided to enter the announced "Capture the Flag Tourney" in Interspace in order to limit the amount of chaos as well as finishing the battle as soon as possible. Before that, he and Marucho tried to convince Paige and Rafe not to enter, where they refused. Later on, when Boulderon and Wolfurio were badly injured during the brawl with Team Anubias, Tristar made interference and transported them to safety. As a result, Rafe and Paige decide to stick with Marucho's strategy, and Tristar and Wolfurio were able to distract Sellon, her Bakugan Spyron and her Mechtogan Braxion in order to enable Boulderon to take the flag in which they succeed.
In Re-connection, he battled Spyron in the semifinals and won. In the finals, he battled Taylean and lost.
In Triple Threat, he and Taylean battled Horridian and Bolcanon in the finals match. Both his opponents used their Bakunano giving them a hard time. Taylean later took Bolcanon out. He and Taylean were ready to take out Horridian when the battle got interrupted by Mag Mel's Chaos Bakugan invading Interspace.
In Dangerous Beauty, Tristar is in ball form and is upset that he didn't get the chance to participate in the battle.
In Interspace Armageddon, he joined in the fight against Mag Mel's Chaos Bakugan in Bakugan Interspace before it got deleted.
In Dark Moon, he, Drago, Taylean, Wolfurio, and Boulderon fought to protect Earth and the universe from total destruction but got defeated by Razenoid while trying to protect Drago.
In The Final Takedown, he was still fighting against all the Razen Titans and beat one using the ability Press Impulse. Later he was happy that Drago survived the explosion of the Dark Moon.
Sometime between The Final Takedown and Evil Arrival, Tristar parted ways with Marucho. However, rather than returning to Gundalia, he opted to live on New Vestroia instead.
Because the Brawlers used the Current of Time to go back and destroy Mechtavius Destroyer before he killed him, he is now either living peacefully on New Vestroia or reunited with Marucho at some point.
- Abyss Cyclone (Tempest Cyclone)
- Fierce Stream (Japanese version: Dia Stream)
- Hyper Stream:
- Aquos Mine: Nullifies the opponent's ability.
- Crush Buster:
- Shield Cyclone: Makes Infinity Trister immune to Gate Card effects and nullifies the opponent's ability.
- Climb Water: Allows Tristar to merge himself to another Bakugan and makes his power level equal to his opponent's. All subsequent abilities activated by the enemy will target both Trister and enemy Bakugan while its active.
- Stun Current:
- Grassed Out (Japanese version: Blau Stealth): Makes Trister immune to abilities and BakuNano.
- Ground Freeze (Japanese version: Blau Freeze): Nullifies the opponent's ability and prevents them from activating new ones. It also prevents opponents BakuNano from working.
- Round Bunker (Japanese version: Blau Bunker)
- Hold Over: The opponent can't move or use any abilities until the battle is over, but BakuNano and Mechtogan can still be used.
- Hyper Pressure:
- Pressure Edge (Japanese version: Thresher Edge)
- Metal Prowl (Japanese version: Metal Blau)
- Press Impulse:
In the game, Infinity Trister is a BakuTactix Bakugan. The Pyrus version has been seen with 600/650/700/750/900/1000 Gs. The Haos version has 600/700/850/900/900/950 Gs. The Aquos version has 650/700/750/800/850/1000 Gs. The Darkus version has 750/850/950/1000/1150 Gs. He has also been seen in Ventus in a Mechtogan Extension Pack (700/750/800/850,950,1050 Gs).
- His appearance is somewhat similar to Elemental Hero Glow Neos from Yu-Gi-Oh! GX, as well as T.G. Striker from Yu-Gi-Oh! 5D's.
- His personality is also similar to Plitheon's, as he is easily annoyed.
- In the Japanese version, some of his abilities start with Blau, German for blue, matching the color for Aquos attribute.