The elevator in The Big Bang Theory is finally fixed in the penultimate episode of Season 12, “The Change Constant,” and it appears working again in the series finale.

What happened

  • The show explains the elevator has been broken since an earlier explosion in the building.
  • For most of the series, the characters use the stairs as a running gag.
  • The big payoff comes near the end of the show, when Penny rides the repaired elevator.

Episode answer

  • First shown working again: Season 12, Episode 23, “The Change Constant.”
  • Confirmed again in the finale: the elevator is functioning normally.

Simple takeaway

If you mean “when does it work again?” the answer is at the very end of the series, in Season 12.