"Of course! We may not know where the Elements are in this time, but we know where they were in the past. If we go back in time again, before T took the Elements, we can return to this time with the Elements of Harmony from that time. Right?" Twilight looks at Doctor Whooves, who looks back skeptically.
"As the local expert on time travel, I'm not sure that's how time travel works. However, I'm not sure that's not how time travel works. It's as good a plan as any. Everypony, get back into the TARDIS. Let's give this time heist a shot."