Lexie first appeared on Grey's Anatomy at the tail end of Season 3, joining the cast full-time in Season 4. Her first day as a surgical intern at Seattle Grace also revealed that she was in fact Meredith's sister, though the two didn't have much of a relationship to speak of beyond their genetic ties.
Because Lexie was absent for a portion of Season 8, some initially suspected that she was being written out of the show long before it happened.
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