Greenscreen man is a mod i made just for fun. He's very fast, and attacks you when he's been hit. When killed he drops a "Greenscreen brick" which you can smelt in a furnace for Uranium, or put it in ur crafting table for Bricks (full block)
There's also a bunch of greenscreen tools and stuff like that.
But there's also a "Green Screen Temple" which spawns WAY TOO OFTEN in plains biomes