Bestworld
MBA
the surest sign a writing team has completely run out of ideas is when they start introducing time travel.
The whole thing about "The Nether" is a complete fail-safe as well anyways. They didn't even need time travel tbh. Too much mystery is revolved around The Nether, and just enough is known to go in crazy amounts of directions, as they already did once with the resurrection of Illidan. It literally gives them the opportunity to twist and turn any event.