Dino Geist is the most powerful of the Geisters, boasting immense size, power and agility. He can either transform into a horned Tyrannosaurus Rex or a jetcraft for transportation. He is also shown to be a competent strategist compared to the rest of his minions, often coming up with plans that can put the Kaisers in a pinch.

When the Geisters arrive on Earth, Dino Geist lay dormant in his hideout and lets his minions steal all the treasures for him. However, the Space Police Kaisers have also arrived to arrest them. After numerous failed attempts to capture some treasure, he has had enough and decides to join his minions to get the next treasure, upon stealing which, a cruise ship with Kouta and his friend and family were on, he had a customer named Trader come down to buy it. However, Exkizer arrives and fights Dino Geist. Exkizer uses his finishing move, which Dino Geist survives before he escapes. After this, Dino Geist has occasionally joined his minions to capture other kinds of treasure, but always ends up fighting against Exkizer. Near the end of the series, the Geisters have found a shield with a mirror that can imprison living things inside - Dino Geist decides to use this on the Kaisers; during their plan to sell an oil rig to Trader, the Max Team's combined form, God Max, arrives to stop them. But the Geisters imprison him inside. When Exkizer and Ultra Raker arrive, they manage to stop Dino Geist’s plan but fail to rescue God Max. Later, Dino Geist has his minions lure out the Raker Brothers. When they face Dino Geist as their combination, Ultra Raker, they end up suffering the same fate as God Max. Exkizer tries to save them, but the Geisters escape. In the final confrontation, Exkizer fights off against the Geisters again. During their battle, Kouta manages to free God Max and Ultra Raker from the shield. After being freed, they help Exkizer fight off against the Geisters.