Grey’s Anatomy “Two Against One” starts off with a fretful Bailey scouring every corner of her son Tucker’s room to find the cause of the rotten smell and Meredith (Ellen Pompeo) gleefully putting on a brief presentation of the 3D printer she got for the hospital from her research proposal on portal veins.

Meredith’s voiceover in “Two Against One” – “Whatever the tumor, people assume you approach it the same way. You find its hiding place in the body, then open the patient up and you cut it the hell out" – plays as Bailey (Chandra Wilson) in a trance-like state determinedly searches Tuck's room. Is Mer talking about the root of the smell, or does Bailey have a tumor?

After getting the lecture from Cristina (Sandra Oh) about how she’s become a less worthy surgeon since becoming a mother of two, Meredith is determined to be every bit the hungry surgeon she once was. Before she attempts printing a liver replica, she shows the fellow surgeons its ability to print a fork. No one is particularly impressed, but Shane (Gaius Charles) sees another possibility for the printer – and it could save someone’s heart. He tells Christina, who’s leading on the heart case, about his plan. But since she knows she’s on thin ice with Mer, who’s currently printing that liver, she initially shuts him down.

Dr. Emma Marling, Owen’s (Kevin McKidd) girlfriend, is back and interviewing for a job at Grey Sloan Memorial Hospital. Taking on the job of interviewer is Callie (Sara Ramirez), who’s really interviewing the doctor to see if she’s a good match for Owen. And since Emma has been through a divorce, Callie is also not-so-subtly picking her brain for suggestions in dealing with having an ex as a coworker.

Callie seems to be considering the possibility of uprooting from Seattle, as Arizona (Jessica Capshaw) has settled into a pseudo-relationship with intern Leah (Tessa Ferrer). While it looks like the two might be done for good, Arizona appears to be starting to have second thoughts. Before getting into the shower with Leah, she doesn’t seem to want to take off her wedding ring necklace. It remains to be seen whether the longtime couple and mothers to Sophia will make another go of it.

April (Sara Drew) and Matt, who are just at the beginning of their relationship, are getting ready to wed. After hearing from their priest that they have a 90% compatibility score, they’re thrilled – but wonder whether or not they're “equal.” April first thinks her husband-to-be means financially, but he really means sexually. He’s still a virgin, while she gave up her virginity to Jackson after failing her Boards. He wants to have sex before the wedding, but April pumps the breaks, telling him he shouldn’t have to break his vow to God too.

While getting the 3D printer was a definite coo, Meredith still has more to prove in the operating room. Working on an adolescent boy with stomach cancer with Alex (Justin Chambers), she gets slightly reckless, believing she can take on the impossible. Pulling out the “two against one” card, Alex and Stephanie (Jerrika Hinton) stop Meredith before she can take out all the tumors. She stubbornly insists she could have done it. Afterwards, Alex approaches her, telling her he knows what happened in the OR has everything to do with what Cristina said. He tells her she’s a good doctor, but that she wasn’t one today.

Still angered by Cristina’s remarks, Meredith shuts her best friend down when she asks about using the 3D printer. The printer is currently hard at work on a 3D organ – a process that takes about a day to complete. Stopping the progress will set Meredith’s research back. As Christina and Shane’s patient’s health gets even worse, they decide to commandeer the printer. Meredith walks in to catch them hunched over the machine, and immediately calls betrayal.

Bailey is worried about far more than that rotten smell in Tucker's room. She’s worried about which OR room she’s placed in. She’s worried about it being set up properly for her procedure, about her patient getting multiple colonics, about Jo (Camilla Luddington) dropping her hand beneath the decontaminate line, about a bubble. Her hands freeze during surgery and her mind looks blank. Ben (Jason George), who thankfully traded places with another anesthesiologist, is able to relax her enough to get her through the surgery. Back at home Ben confronts her, asking her what’s going on. She insists she’s fine, but as the episode ends she frantically counts off on her fingers, appearing to be on the verge of a breakdown.

Grey's Anatomy airs Thursdays on ABC at 9/8c.

– Chelsea Regan

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For More 'Grey's Anatomy' Recaps:

‘Grey’s Anatomy’ Recap: Zombie Patient Bites Leah; Bailey Fights With Richard & Ben

‘Grey’s Anatomy’ Recap: Derek Supports Meredith’s Career; Arizona And Leah Heat Up

‘Grey’s Anatomy’ Recap: Cristina Disses Meredith; Callie & Arizona Look Headed For Divorce

‘Grey’s Anatomy’ Recap: Owen Moves On From Christina; April & Arizona Bond; Alex Treats His Father