Margo Harshman as Alex Jensen – Then:
The character of Alex is introduced as a doctoral student placed with Sheldon as a research assistant. Still, Sheldon often gives her busy work rather than allowing her to help him. When he brings her back to the gang with him, she develops a noticeable crush on Leonard, which Penny takes note of, though Leonard remains oblivious. She eventually tries to ask Leonard out, but he maintains his fidelity to Penny and turns her down.
