I have a new video game with interested companies, but I need some financing to get started, who can help me?

I have a couple of companies who are interested in creating this new game that could sweep the globe, but I need a small fee to get this started. I am willing to pay back double the investment to the willing party just to get this great game off the ground. Maybe with a substantial investment, I may even consider part of the royalties for a period of time.