The Doctor and Ruby meet The Beatles but discover that the all-powerful Maestro is changing history. London becomes a battleground with the future of humanity at stake. The Doctor and Ruby meet The Beatles but discover that the all-powerful Maestro is changing history. London becomes a battleground with the future of humanity at stake. The Doctor and Ruby meet The Beatles but discover that the all-powerful Maestro is changing history. London becomes a battleground with the future of humanity at stake. The Doctor and Ruby meet The Beatles but discover that the all-powerful Maestro is changing history. London becomes a battleground with the future of humanity at stake.