User blog comment:Barry19/TDA S1 OPENER NAMES REVEALED!!!/@comment-27270572-20150620173429

The Keys to Infinity and The Ultimate Weapon both sound quite awesome. A theory of mine is that the keys will lead to the ultimate weapon and the series arc will show the Doctor going around time and space trying to acquire the keys so that no one can use the ultimate weapon. The two titles are very awesome! i cannot wait for this to happen!