Daniel Hashimoto - known as Hashi - works as an animator for movie studio Dreamworks, and put his professional skills to turn the little boy into an action star, complete with explosions, pools of lava and rocket launchers.
Speaking to the Ellen DeGeneres Show's Good News blog, Hashi revealed that he was inspired by James' vivid imagination when playing.
"He has a really great imagination," Hashi said. "He'll always wake up and tell me the character he is that day.
"One morning he was being Iron Man and he was blasting everything in the kitchen. And so I decided to film it and composite a laser in there." One thing led to another, as Hashi used his talents to make his three-year-old's flights of fancy a reality.
One clip shows the little lad use a building block 'pistol' to blast away a wall, before modestly explaining that it's 'kinda like a real gun'. Another brilliant sequence sees the toddler playing with a 'grappling hook' that suddenly yanks him up onto the ceiling.
According to his dad, at first James was overwhelmed when he saw what he believed to be raw video footage of his exploits. He even appeared overcome with remorse for the destruction he had seemingly caused to local homes and businesses, asking "Why did I do that?"
Hashi explained to the New York Daily News that James 'doesn't watch TV or movies very much', despite the fact that his dad has worked on animated blockbusters such as Shrek Forever After and Kung Fu Panda 2.
Once Hashi uploaded the videos to his YouTube channel, they became an instant hit, now with over a quarter of a million subscribers.