|Home world:||Planet Earth (Giants of Light Timeline)|
|First appearance:||Ultraman Dyna episode 3 "Wake Up, Asuka"|
|Latest appearance:||Ultraman Dyna episode 27 "Monster Game"|
- Subtitle (Grossyna): Revived Monster (再生怪獣 Saisei kaijū?)
- Subtitle (Grossyna II): Modified Monster (改造怪獣 Kaizō kaijū?)
Grossyna was a monster that first appeared 10 years ago and was struck down by GUTS/TPC. However, over the years, Grossyna's body had yet to rot away and was found by a lone surviving Cyclometra. The parasite then crawled into the body of the long dead monster and revived him. The next day, Grossyna began his movement in a forest, and came under fire of Super GUTS. However, due to the rational decisions of Asuka, Super GUTS's captain, Hibiki, was wounded and can no longer attend to battle. After discussing, it was decided to have Asuka use the Cyclometra mating call to lure Grossyna to a special area, where the machines by the name of "Laser Wire" will launch electrical "strings" at Grossyna, keeping it in place while Kariya, in the GUTS Eagle Gamma, will fire a fatal beam that will penetrate Grossyna's neck and kill it. However, the shot was useless as Cyclometra miraclously appeared and healed Grossyna, while enchancing its power. The enraged beast then snapped the wires and began to rampage, downing the already injured Hibiki. Asuka then transformed into Ultraman Dyna to fight the threat. However, the battle turned to the side of Grossyna due to his superior strength. Finally, Dyna blasted a hole through the body of the monster with the Solgent Ray, causing the very impatient Cyclometra to burst out and Dyna then killed it with the Flash Light Bullet.
- Although Grossyna was stated to be killed by GUTS, he was never shown or talked about in Ultraman Tiga.
Generation IIA digital Grossyna reappears in the Giant Monster Coliseum video game.
Grossyna II was made by an unnamed boy that competed in the Alien Chern's Monster Tournament . Grossyna II was made from the already-existing data for Grossyna and proved to be either good or powerful enough to make it to the last round of the tournament where it fought Demagorg. Despite its efforts, it was defeated by Demagorg and eaten.
- Although in the original datafiles for Grossyna in the Super GUTS library stated the name as "Grossyna", the game states it being "Glossena".
- Height: 57 m
- Weight: 50 000 t
- Origin: Suruga Bay
Powers and Abilities
- Fireballs: Grossyna can launch fireballs from his mouth. These fireballs are launched in a formation of several miniature fireballs surrounding a large one. All of these fireballs can cause damage.
- Regeneration: Due to the fact that a Cyclometra is in his body, Grossyna can regenerate to heal himself from fatal damage.
- Body Preservation: Grossyna's corpse can survive for a long time after death, being the perfect host for parasites.
- Electric Tail: Grossyna's tail can be used to grab someone or something, after grabbing, he can send out red electric shocks.
- Height: 60 m
- Weight: 57,000 t
- Origin: game space
Powers and Abilities
Unknown, though he was among the strongest.