[quote=@Shadow Dragon]
<Snipped quote by ZAVAZggg>

I thought they needed Seconds strings to time travel.
[/quote]

that might be for time travel in all dimensions at once as I doubt a Time Lord or some such from the Doctor Who universe/dimension needs Seconds strings to use the Time Vortex.

Edit: To quote someone who knows...

[quote=Host]In MR, every dimension has its own (or multiple) time travel systems, often defined by whatever method the time traveler uses to go back in time—that way it can work however you want. If they want to go back in time in every dimension at once, it's a little more convoluted.[/quote]