Tonight’s episode of “Grey’s Anatomy” was all about Maggie. From start to finish, “A Puzzle with a Piece Missing” followed the story line of Margaret Pierce (Kelly McCrery), showing viewers her current struggles at Grey Sloan Memorial Hospital as well as a peak into her past. And yes, tonight was the night that Maggie confessed to Meredith (Ellen Pompeo) the truth about being her half-sister. It was b-a-n-a-n-a-s! But before we dive into that juicy scene, here’s what happened leading up to the most climatic moment of episode 2.

A "Puzzle with a Piece Missing” kicked off with Maggie explaining why tonight’s installment was named after the hit Gotye song. “Once I pick a puzzle up I can't put it down until it’s solved,” Yang’s (Sandra Oh) replacement revealed, along with her record-breaking time for solving a New York Times crossword. “I think that’s why I went into medicine.”

And medicine is what Maggie focused on during her first few weeks at Grey Sloan. Instead of making friends, Maggie spent her days either talking to her parents (lying that she made friends) or working. However, she did take a moment to be truthful with her adoptive folks when she said opening up to Meredith was a no-go. The two ladies have been bickering like sisters since the Season 11 premiere kicked off. And as episode 2 progressed, their sibling rivalry only heated up with every diss.

But Meredith wasn’t the only one who had problems with Maggie in episode 2. The new head of Cardiothoracic Surgery made enemies of Alex (Justin Chambers) when she blew up his spot regarding getting a seat on the board in front of his current boss (Alex ended up getting fired), Owen (Kevin McKidd) when Maggie wanted to surpass Yang’s research by using a new method (clearly Owen doesn’t like Maggie stepping on Yang’s invisible toes) and Jo (Camilla Luddington) when she dismissed her from rounds.

Prior to getting dismissed, Maggie and Jo formed a sort of teacher-student relationship as they made their rounds early on in episode 2. But when Jo overstepped her boundaries (giving a patient advice to let her mother die), Maggie lashed out. A few heated moments later, Maggie said she was just “bringing the thunder,” something she does when she wants to prove she’s more than just a youthful doctor or pretty face. She then advises Jo to find her own thunder, which the resident does during the very last moments of episode 2. Looks like Maggie can add “role model” to her eclectic resume!

Episode 2 only seemed to get rockier for Maggie when she divulged false information during lunch. After meeting Derek (Patrick Dempsey) and Meredith’s adopted daughter Zola, Maggie congratulated Derek on the job in D.C. – a sore subject for the couple.

“I’m just killing it today,” Maggie said when Derek told her he decided to pass up on the offer to be with the family.

“Isn’t that going to get cold?” Meredith said slyly, insinuating Maggie should leave. That’s when Maggie headed over to Dr. Webber’s (James Pickens Jr.) table. Despite their previous conversation about keeping Maggie’s personal and work life separate, the doctor asked for his advice regarding whether or not she should open up to Meredith.

But soon the discussion took a very different turn when Maggie explained the process of Ellis (Kate Burton) giving her up for adoption.

“Giving you up was the hardest decision of her life,” Webber said, which caused Maggie to wonder just how close her superior was to her mother. Piece that puzzle together, Mag!

After Webber’s advice, Maggie decided to approach Meredith. Not to talk about their shared family tree but to hash out a problem regarding Meredith going behind Maggie’s back with her patients. However, their serious talk was put on hold when a singing fish came out of the woodwork, welcoming Maggie to Grey Sloan through a song-gram. We’re not going to lie – it was pretty hysterical. And we’re not the only ones who thought so!

“It was hilarious. The timing couldn't have been better,” Maggie said to her parents about the musical fish. “It was incredibly cheesy and I loved it.”

That’s when Maggie broke down, explaining that coming to Seattle from Boston might have been a bad decision. “I think it might have been a mistake coming here. I don’t feel like I can be myself,” she said on the phone.

But Maggie finally felt some comfort in Grey Sloan when she befriended Amelia (Caterina Scorsone), who reminded her how to smile. Not like it was hard – a patient of theres was given a stroke from having "great sex."

“The sex blew her mind,” Amelia quipped. A few intercourse jokes later Amelia revealed how she felt like an outsider, too – that is until she met Meredith. She explained that although the two didn’t see eye-to-eye at first, she felt like Meredith is closer to her than even her own flesh and blood.

After a bumpy start, the episode smoothed out for Maggie when she saved the life of a mother and child and found the cause of death for a child whose parents were blaming themselves. “I’m glad you’re here,” Owen said, recognizing Maggie’s intelligence as she stepped out from Cristina’s shadow.

But her congratulations were interrupted when Meredith ratted on Maggie, claiming she had purposely let a patient die. Maggie handled the accusation like a pro, then following her half-sister to explain why she had let the old woman die.

“You look me in the eye and tell me you wouldn’t do the same thing?” Maggie asked after revealing her patient was tired of being kept alive. For a moment we thought their relationship was fixed after Meredith backed Maggie up, claiming to the daughter of the deceased that “Dr. Pierce did everything in her power” to help.

But any good feelings between the two were completely destroyed when Maggie revealed to Meredith the truth about being Ellis’ daughter – her half-sister.

“My mother was Ellis Grey,” Maggie blurted out. “I know. I’m sorry. This isn’t fair to you and we got off to a bad start.” Maggie then told her the whole story about how she was put up for adoption in Boston. “My mother was your mother – Ellis Grey.”

Meredith was in disbelief. “What do you want? What are you after here? You’re five years younger than me. If my mother were pregnant I would have know. You’re lying. Stay away from me.”

What did you think of Meredith’s reaction to Maggie’s confession? Sound off in the comments section below to what you thought of how episode 2 of “Grey’s Anatomy” ended.