(This article contains possible spoilers for those that are not caught up with the show)
A woman from Leonard’s past will be introduced in season 9 of The Big Bang Theory. Mandy, played by Melissa Tang (Mom), will be the “other” woman in Leonard’s life and is also the girl Leonard kissed while away on the North Sea Expedition.
The Big Bang Theory will return September 21 and will pickup “a few hours after the events of the Season 8 finale, with Leonard and Penny en route to Vegas to tie the knot (but with Leonard’s infidelity threatening to derail the whole shebang).”
Source: TVLine