Jean Grey is at Dark Phoenix powers and is limited to using her TK abilities. Flash is Wally West and is limited to only going 5 times the speed of light. Spider-man does not have his web-shooters and is going all out. Superman is limited to using his flight and invincibility only. Dr. Doom has discovered the Silver Surfer's Power Cosmic again and has been able to alter his opponents abilities that is why they are limited in their abilities. Battle takes place in Manhattan, morals are on. So who do you think would win.
I am changing the scenario. Jean is not in the fight seeing as most people think she can sole Dr. Doom(with Power Cosmic) herself. SO it's just Superman, Flash, and Spider-Man limited in power by Dr. Doom, and ONE more provision Dr. Doom can't steal Superman's solar energy from his body by using the Power Cosmic and used it to beat him; neither can Flash take Dr. Doom's speed by speed steal, even though I don't think that would work anyway, but whatever.