'Grey's Anatomy': The Many Hookups of Alex Karev
Ava/Rebecca (Elizabeth Reaser)Alex rescued Ava, a then pregnant Jane Doe from the ferryboat disaster in Season 3. The two grow close as she tries to remember who she is and he helps her develop the identity of Ava. After giving birth to her daughter, her memory returns and she remembers she is Rebecca Pope. She returns in Season 4 and sleeps with Alex before returning to her husband. Later she returns and pretends she is pregnant. Her lie and attempt at suicide causes Izzie to convince Alex to admit her psychiatric help. This brings Izzie and Alex back together.