Hands down FF 39-40! The FF loses their powers thanks to Dr. Doom, who uses this opportunity to take over the Baxter Building. Daredevil helps to keep the FF alive and guides them into the Baxter Building, where he single handily takes on Dr. Doom and keeps him busy until Reed uses one of his inventions that bestows their powers on them again. I'm a little biased because Daredevil is my favorite marvel hero, but those two issues were incredibly exciting.