Robin Roberts' return to "Good Morning America" Wednesday marked the end of a long road that began with her announcement she had a rare blood disorder called myelodysplastic syndrome or MDS and would take medical leave from morning TV to undergo a bone marrow transplant. As the anchor left to take care of her health, cameras followed her journey. The personal and candid look at her fight against MDS, filled with laughter and tears, will air on a special "20/20" tonight at 10 p.m. ET.

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