Title: Grey's Anatomy (season 16)
Content:  On May 10, 2019, with the renewal announcement it was revealed that Chris Carmack, Greg Germann and Jake Borelli had been promoted to series-regulars. In October 2019, it was announced that Richard Flood had been cast as the new head of Pediatric Surgery at Grey Sloan, replacing Karev, who was fired in the previous season. On January 10, 2020, it was announced that Justin Chambers would be leaving the series, with his last episode being the 350th.
Title: Mark Sloan (Grey's Anatomy)
Content:  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. Mark caused the end of Derek’s marriage by sleeping with Derek's then-wife, Addison Montgomery. Mark moves to Seattle in season three to make amends with Derek and becomes Seattle Grace Hospital's new plastic surgery 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.
Title: Grey's Anatomy
Content:  On January 9, 2018, it was announced by Sarah Drew on her Instagram page that a 6-episode spin-off series following the new interns of Grey Sloan Memorial would be released for streaming on the ABC app and abc.com on Thursday, January 11, 2018. Grey's Anatomy: B-Team stars Sophia Taylor Ali (Dahlia Qadri), Jake Borelli (Levi Schmitt), Alex Blue Davis (Casey Parker), Jaicy Elliot (Taryn Helm), Rushi Kota (Vik Roy) and Jeanine Mason (Samantha "Sam" Bello) with special guest appearances made by Justin Chambers (Alex Karev), Kelly McCreary (Maggie Pierce), Kevin McKidd (Owen Hunt) and James Pickens Jr. (Richard Webber). The 6 episodes in this series were written by Barbara Kaye Friend with Grey's Anatomy series regular Sarah Drew (April Kepner) making her directorial debut directing each of them.
Title: Grey's Anatomy (season 3)
Content:  Dane was also promoted to the series regular status after a guest appearance in the eighteenth episode of the previous season, and an uncredited one in the second episode of this season. He began receiving star-billing in the third episode of the season, portraying attending physician, otolaryngologist and plastic surgeon Mark Sloan, whose arc, describing the attempt at resuming his relationship with Addison Montgomery, is heavily developed throughout the season. Numerous supporting characters have been given expansive and recurring appearances in the progressive storyline. Brooke Smith continues her role as cardiothoracic surgeon Erica Hahn, whose storylines include the rivalry with Preston Burke, her arrival to perform surgery of George O'Malley's dying father, 
Title: Grey's Anatomy
Content:  who was not originally included in the show's pilot, but added through digital editing and additional scenes.  Season 2 marked the introduction of attending doctors Mark Sloan (Eric Dane) and Callie Torres (Sara Ramirez). They were initially cast as recurring characters, but both were given star billing at the opening of season 3. Ramirez was cast after ABC executives offered them a role in the network show of their choice; Dane had previously auditioned unsuccessfully for a role in the pilot episode. Dr. Addison Montgomery (Kate Walsh) also joined the show in season 2, after making a guest appearance in the season 1 finale 
Title: Grey's Anatomy
Content:  for Los Angeles at the end of season 3; Mark Sloan (Eric Dane), head of plastic surgery; Callie Torres (Sara Ramirez), a resident who later becomes head of orthopedic surgery and leaves Seattle for New York at the end of the twelfth season; Erica Hahn (Brooke Smith), as head of cardiothoracic surgery, who leaves Seattle Grace in season 5 after a disagreement with Torres, with whom she shared a brief relationship; Owen Hunt (Kevin McKidd), as head of trauma who later marries and divorces Yang; Arizona Robbins (Jessica Capshaw), as head of pediatric surgery, and later head of maternal / fetal surgery who 
Title: Grey's Anatomy
Content:  Introduced in the show's second season are obstetrician-gynecologist and neonatal surgeon, Addison Montgomery, plastic surgeon Mark Sloan (nicknamed 'McSteamy' by the interns), from New York, and orthopedic surgeon Callie Torres. Montgomery is Shepherd's estranged wife who arrives in Seattle seeking reconciliation with him, Sloan is Shepherd's former best-friend, who aided the breakdown of his marriage by having an affair with Montgomery, while Torres is introduced as a love-interest, and eventual wife for O'Malley. The penultimate episode of season 3 introduces Lexie Grey, Meredith's half-sister who unexpectedly decides to pursue her internship at Seattle Grace Hospital after her mother's sudden death, and begins an on-again, off-again relationship with Sloan. Burke 
Title: Grey's Anatomy
Content:   Greys Anatomy follows the lives of surgical interns, residents, and attendings at the fictional Grey-Sloan Memorial Hospital (formerly Seattle Grace Hospital, Season 1–6, Seattle Grace Mercy West Hospital, Season 6–9, and then Grey-Sloan Memorial Hospital, Season 9–present), as the interns gradually develop into seasoned doctors through the mentoring of their residents, attendings, and chiefs of surgery. Each installment typically begins with a voice-over narrative from Meredith Grey or a season regular, foreshadowing the theme of the episode. Each season tends to represent the physicians' academic year, with each completed year qualifying the residents at a level higher in the surgical field. The season typically ends with a dramatic event such as a death or character departure. 
Title: Grey's Anatomy (season 17)
Content:  "Now or Never" in the fifth season. Chyler Leigh and Eric Dane both appeared in "Breathe" as Dr. Lexie Grey and Dr. Mark Sloan, respectively. Prior to their return, Leigh and Dane last appeared in the eighth-season finale "Flight" and "Remember the Time", the second episode of the ninth season. Due to travel restrictions, Leigh was not able to travel to Los Angeles where production takes place, instead she filmed her scenes in Vancouver, Canada. Leigh was filming Supergirl at the time; a green screen was used to eventually place her on the beach and an apple box was used to simulate rocks while tennis balls were used in place of Pompeo and Dane for 
Title: Samantha Sloyan
Content:  Samantha Sloyan (born January 4, 1979) is an American actress. Sloyan is best known for her roles in In the Key of Eli, Scandal, Hush, Midnight Mass, and Grey's Anatomy.

Question: when does sloan come into grey's anatomy?
Answer: season two.