Mother (Star Wars) vs Sovereign (Mass Effect)
Two sentient space stations/ships battle it out. Fight takes place in the expanse of space, with nothing in the vicinity except a black hole that is slowly pulling them in. They have thirty minutes to destroy the other. If one succeeds in doing so within the allocated time, an incredible and mysterious force will teleport it into a faraway location. If not, both will fall past the black hole's event horizon and be destroyed.