Steve is a member of SALF, an organization made for the pursuit of aliens and one of the three main antagonists of Scooby-Doo and the Alien Invaders. He disguised himself as an alien to raid the gold underground.
He was voiced by Mark Hamill (who is famous for voicing The Joker in the DC Animated Universe).
He works for the SALF with his two colleagues Max and Laura, he seen in the station when Max heard something strange from the monitors, of course him and his friends are convinced that they enter in contact with aliens. When the gang came across the station him and his colleagues welcome them, has they talked Velma see some mud on his shoes (Included on the shoes of his colleagues), which she became suspicious about them, has they talk they tell the gang that they might be in contact with aliens since they heard something on the monitors.
Of course Steve and his friends then disguised themselves has aliens, they scared Scooby and Shaggy just before kidnapped them, just before meeting Crystal and Amber, but when the gang enter the mine him Laura and Max cover are blow up by Velma has their accomplice go to search for Shaggy and Scooby, that's where they finally revealed that they discover that they found the mine was full of gold and they wanted to used it for their own interest.
While the rest of the gang still their prisoners their henchmen come back and tell them that they found real alien, which they think that they have hallucination because only him Laura and Max are the aliens, but they realize that they were telling the truth, Steve and Laura wanted to capture Crystal and Amber has Max was trapped with their henchmen, but thanks to Shaggy and Scooby their plan failed, the three SALF members and their henchmen are arrested by the police., saying the ever popular cartoon phrase, "We would've gotten away with it if it Hadn't have been for those Meddling Kids!".