Question: when does sloan come into grey's anatomy
[{'answer': 'season two', 'provenance': [{'wikipedia_id': '10213087', 'title': "Mark Sloan (Grey's Anatomy)", 'start_paragraph_id': 1, 'start_character': 214, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10213087', 'title': "Mark Sloan (Grey's Anatomy)", 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1932, 'bleu_score': 0.9858077263851711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10862657229425122756}, 'section': 'Section::::Storylines.\n'}]}, {'provenance': [{'wikipedia_id': '10213087', 'title': "Mark Sloan (Grey's Anatomy)", 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Mark Everett Sloan, M.D., F.A.C.S. is a fictional character from ABC\'s medical drama television series "Grey\'s Anatomy", portrayed by Eric Dane. Created by showrunner Shonda Rhimes, the character was introduced in season two as Derek Shepherd\'s best friend who caused the end of Shepherd\'s marriage by sleeping with his then-wife, Addison Montgomery. He moves to Seattle in season three to make amends with Derek and becomes Seattle Grace Hospital\'s new plastics attending, after which he is dubbed "McSteamy" by the female interns for his good looks. Mark\'s focal storyline in the series involved his romantic relationship with Lexie Grey (Chyler Leigh), one of the interns who was on his service when they started dating. Both he and Lexie sustained fatal injuries during an aviation accident in the eighth-season finale, and Seattle Grace Mercy West is later renamed Grey-Sloan Memorial Hospital in their memory.', 'Mark Everett Sloan, M.D., F.A.C.S. is a fictional character from ABC\'s medical drama television series "Grey\'s Anatomy", portrayed by Eric Dane. Created by showrunner Shonda Rhimes, the character was introduced in season two']}}]}, {'provenance': [{'wikipedia_id': '1660277', 'title': "Grey's Anatomy", 'section': 'Section::::Production and development.:Casting.\n', 'start_paragraph_id': 27, 'end_paragraph_id': 27, 'meta': {'evidence_span': ['The second season marked the introduction of attending doctors Mark Sloan (Eric Dane) and Callie Torres (Sara Ramirez).', 'Dr. Addison Montgomery (Kate Walsh) also joined the show in season two, after making a guest appearance in season one.']}}]}]