This week's Grey's Anatomy finds Alex (Justin Chambers) on the search for his missing mother Helen, and things don't go as planned.

In an exclusive sneak peek at the episode, titled "Fight For Your Mind," he and Jo (Camilla Luddington) pull up to Helen's house but she doesn't appear to be home. Instead, a mysterious man pops up to tell Alex a very important piece of information — presumably about his MIA mom — which doesn't get revealed just yet. Sorry, but it looks like you're going to have to wait until Thursday to find out what exactly he said.

Grey's Anatomy: April and Arizona's Departures Are Beginning to Take Shape

The episode will see the Bionic Woman herself, Lindsay Wagner appear as Alex's mentally ill mother, Helen. We previously met her in a flashback earlier this season — Emily Rutherfurd played a younger version of her — but this will be the first time we meet her in the present day. The question is, what will happen when he actually finds her? After all, they don't have the best relationship so this potential reunion probably won't be a happy one.

Find out how his search ends when Grey's Anatomy airs Thursday at 8/7c on ABC.

Justin Chambers, <em>Grey's Anatomy</em>Justin Chambers, Grey's Anatomy