It's the Avengers teamed with their thinly veiled DC counterparts, the Squadron Supreme!  We're finally finishing up the plotline from the main title, as we see the two teams join together to fight the main villain behind this storyline, Imus Champion!  Who?  Go back and listen to one of our early 70's episodes and you'll hear all about him.  But can he take our two teams of two Earth's Mightiest Heroes?