That planet you’re orbiting may look familiar, but how can you be sure it’s the one you left behind? After all, whether you’re getting around with hyperspace, subspace, or something more exotic entirely, you’re leaving the normal universe, with its well understood physical laws, behind. If even the slightest thing goes wrong (or right), you might find yourself in a world both unsettlingly alien and uncomfortably close to home. Alternate universes, where your closest friends are dire enemies or the human race has succumb to tyranny. The rules of these places may go against everything you’ve fought for, but it’s hard enough to save one universe–to try to set things right in all the infinite universes is a task not even Sisyphus would envy.

No, the best you can hope for is to get home (which, if you ask Dr. Sam Beckett, is easier said than done), and here are some of the ways to make sure that happens.

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