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The Gemara tells a story about one of history's most famous baalei teshuva - Mar Ukva.
 
Most people - even Torah scholars - drop their jaws when they hear that Mar Ukva was a BT (baal teshuva). He was not only reish galuta, the President of the Jewish People in Diaspora at the time, but he was such an outstanding rabbinical court judge that even Shmuel of Nahardaa - one of the three leading scholars of the generation - looked up to him.
 
Tractate Shabbat mentions a tzaddik by the name of Natan Tzutzita, whose name means that Hashem "gave him a bright light" that reflects from his forehead. Whenever he'd walk in the public domain, this bright light would shine from him, so that's how he got his name.
 
Rashi in an obscure comment found on tractate Sanhedrin 31b, says he discovered in an ancient book of legends that Natan Tzutzita was none other than Mar Ukva, who was a Baal Teshuva. The story makes any Hollywood screenplay look boring...

Mar Ukva, before he became a Baal Teshuva, would freely look at women; that got him into big trouble. Once, he saw a gorgeous woman whom he craved. When he found out that she was married and forbidden to him, he became lovesick and literally bedridden, in danger of his life. Meanwhile, the married woman and her husband became destitute. No one would give or lend them a cent. She knew that Mar Ukva had money, so in desperation, she knocked on his door. In her heart, she was prepared to submit herself to him in order to save herself from such dire poverty. Mar Ukva could have easily taken advantage of her. Instead, without touching her or even looking at her, he gave her the money she needed and sent her on her way.
 
Mar Ukva's phenomenal act of teshuva made such a deep impression in the spiritual realm that the Samech-Mem, Amalek's administering angel, fell over backwards. On the spot, it was decreed that Mar Ukva would not only become a complete penitent, but a magnificent Torah scholar, judge and leader of the Jewish People and a tzaddik whose countenance reflected Divine light just like Moses!