Quantum radio
So Cassie Lang (Kathryn Newton) has turned on this device, which is sending a… signal? to the Quantum Realm. Far from being just the microscopic world, the Quantum Realm is actually a part of the Multiverse that is pretty hard to get to. You need magic or some Pym particles, and the first requires a lot of training and the second is in short supply. But this thing starts flashing, which is very likely Not Good.
