As the fourth season begins, chaotic events at Miami Ink require Ami to get onboard with Nunez's plan for a new shop, and Darren's surprise return from an extended trip adds good cheer.
Dre needs to pass her certification test or the shop will be out a manager; Darren has a new fiancée and a baby on the way.
Yoji is feeling frazzled by married life, so Ami babysits Syd for the day so he can have a quiet lunch with his wife, but Yoji has a hard time relaxing.
Yoji develops a skin condition requiring professional medical attention, despite Garver's best efforts to treat it; a strange odor of unknown origin fills the shop, and the guys give Baby Dre the task of getting rid of it.
Ami animates kids' pictures drawn during an art class she teaches at Miami Children's hospital; Baby Dre takes Yoji shopping for extremely tight jeans, and Ami and Nunez are shocked to see what they bought.
Ami, Nunez, Darren and Dre visit Cape Canaveral to watch a space-shuttle launch, but their RV leaves a bit to be desired, as does Nunez's sense of direction.
Nunez buys his mom a house and helps her move; Ami gets a lesson in jujitsu; Garver tattoos an admirer from Italy; Tim and Nunez give brothers matching scars.
The guys go out for a day at the links, but can't get in because of the golf course's dress code. A clothes-shopping expedition solves that problem, but once play begins the competition is fierce.
Dre asks to have her name added to the shop window, hoping it will make her feel more included on the team; Darren inks an unusual tattoo for a woman who's mourning the death of her husband.
Yoji and Darren work on a baby-clothing line featuring tattoo-based designs, but creative differences cause problems; Ami inks a cherry-blossom tattoo.
The crew tours New Orleans and does a guest-artist stint at a friend's tattoo shop, Eye Candy. Also: a big crawfish dinner; thrills and chills at a haunted hotel.
Yoji takes his wife and baby to Japan so his mom can meet her granddaughter for the first time, hoping to rebuild family ties; a doctor asks Darren to use his skills to help out a young patient.
Ami acts as producer for a mixed-martial-arts fight night, but finds himself in over his head; Nunez helps a cancer survivor; Darren and Talea make last-minute preparations for the newest addition to their family.