For at least two weeks, Maryann quietly lived in a large house in Bon Temps without causing much incident. Some speculate that she was using this time to gather energy from Eggs and Tara, making herself stronger so that she could gradually infect the entire town with her influence. This theory is supported when she uncharacteristically slaps Karl to the ground for interrupting a tender moment between her housemates, ruining the hedonistic energy flow and thus, her meal.
Maryann would later employ several underhanded and manipulative tactics in order to keep Tara near her and Eggs.
- " Nobody needed towels!! "
- ―Maryann doesn't take kindly to Karl's interruption
On her first brief visit to Merlotte's, she eagerly sees Sam having heard that he has a gift for her. Sam apologizes to her for his theft in his younger years, though it is obviously more an apology out of fear than genuine regret. He proceeds to give her a large bag filled with money, and while touched at the notion, Maryann declines his offering saying it's not what she wants. Sam accuses her of trying to somehow punish him by luring Tara into her life, but Maryann dismisses his allegations, implying Sam is vain to think her presence in Bon Temps should be because of him.
Her second visit to Merlotte's is of greater interest, as she arrives early in the afternoon on a relatively slow business day to sample the food, though Sam is reluctant to serve her and wants her to leave. Maryann reminds Sam that she forgave him a $100,000 loan, so the least he could do is let her buy herself some lunch, to which he relents. Maryann then orders everything off the menu, coming to a sum of what Tara would later say was over $300, and impressively consumes all of it.
It was later in this afternoon that she encountered Sookie Stackhouse for the first time, and genuinely praised the young waitress for her positive attitude in the face of what others would see as absolute misery. Sookie, however, throughout the duration of this conversation, had been listening to Maryann's thoughts and found them to be unlike any she had heard before being entirely in another language, in a haunting mantra-like voice constantly invoking Dionysus in ancient Greek.
Sookie coyly asks Maryann where she is from in a suspicious manner, but Maryann retains her demeanor and convincingly lies that she was born in Cape Cod. Uneasy, Sookie excuses herself, but reminds Tara to consider her invitation to move into her house and be her new housemate. Maryann behaves as though she is touched by the gesture, though the look seen on her face (only to the viewer) confirms that she intends to kill Sookie to prevent this from happening.
Later that night after finishing all her food, Maryann begins to seductively dance in the bar, lulling all the patrons into her spell. Slowly but surely, they all begin to dance wildly and engage in lewd behavior turning Merlotte's all but into a dance club. Furious at seeing this, Sam takes Maryann to the back office and demands an explanation, but Maryann plays dumb, denying any responsibility. When he loses his temper, Maryann demonstrates just what kind of power she has by forcing Sam to shapeshift into his Collie form.
Maryann informs him in no uncertain terms that if he ever threatens her again, she will reveal his secret to everyone in Bon Temps.
Later that night, Maryann, in a bull mask and with large, demon-like claws, somehow tracked Sookie down while she was 20 miles outside the city limits and slashed her back, infecting the waitress with an extremely deadly Maenad toxin. Maryann did this in hopes that Tara would not be able to take Sookie up on her earlier offer, and was visibly surprised when she learned that Sookie was miraculously fine the next morning, though she concealed her shock from Tara.
When Tara announced she would indeed move in, Maryann had no choice but to let her go, offering encouraging words and making sure to say she's sure Tara would do the same for her if she could, something she would later put to the test.
Having somehow known the date of Tara's birthday, Maryann arrives at the Stackhouse residence with a wedding cake to throw Tara a party. She invites nearly everyone in Bon Temps, all of whom later that night she drives to primal actions of sex, violence and hunger as she blacks them out and brings them under her power. The next morning, Maryann has clearly made herself at home and decorated the Stackhouse kitchen with luscious fruits and beautiful flowers, to Tara's confusion.
Maryann informs her that she, Karl, and Eggs need a place to stay since her "client" came back from Peru to reclaim his house that she had been watching in his stead. Tara tells Maryann that what she wants isn't possible. She, herself, just moved in and this is Sookie's house, not hers. Maryann puts on a hurt facade by this and claims to understand. Whipping up some fake tears, she leaves the kitchen.
That night while Tara bartends, Maryann covertly arrives at Merlotte's and begins to sway the emotions of all the people inside to feel negatively and focus all this energy at Tara. Tara becomes so frustrated with everyone relentlessly jumping down her throat that she leaves in a huff before her shift is even over. Arriving home, she finds Maryann dressed in uncharacteristically maternal clothing, reading a book, and saying she made Tara dinner and filled the fridge with her favorite foods.
Moved by this, Tara begs Maryann to stay with her.
The next night, Maryann once again brings the entire town under her thrall, this time in preparation to sacrifice Sam Merlotte to her god Dionysus, so he would be born into the world. She accomplished this by having Daphne (the shapeshifter revealed to be the pig who first appeared with her) seduce and lure Sam out to where Maryann was channeling orgiastic energy from the town's citizens. Thanks to a distraction from Andy Bellefleur, Sam is able to escape, however by shape-shifting into an owl he saw while Maryann chased him.
Though Maryann didn't express any malice or bitterness at Daphne's failure (even going so far as to express sincere gratitude), upon their next meeting she had a mesmerized Eggs stab her right through the heart, killing her for giving Sam information about her entity. This cements the notion that Daphne's true purpose was to bring Maryann the vessel, whether she was alive or not hardly being a concern. Daphne's body was left in the freezer in Merlotte's, implicating Sam in the murder and resulting in him being detained in jail.
Sam once again escapes her, visibly irritating her to the point that she decides to bring the entire town under influence once again, this time permanently, until they bring her Sam Merlotte.
When Sookie Stackhouse returns to Bon Temps from Dallas, she finds the town in complete disarray and her house completely made over in a haunting, pagan fashion. Maryann behaves as though the house is hers, taunting Sookie and Bill with her presence. Bill "strongly suggests" that Maryann leave, but she is undaunted, remarking that Bill is quite a specimen, keen to his supernatural, vampiric nature. She also mentions that Bill will "leave Sookie cold," (perhaps foreshadowing his kidnapping only two days later).
Sookie rudely dismisses Maryann, angering the Maenad into attacking Sookie. She pins Sookie against the wall, lifting her up faster than Bill's eyes can follow. Bill Compton pushes her away and bites her neck, but is quickly poisoned by her black blood, much to Maryann's knowing delight. She incredulously clasps Sookie's face, wondering aloud what Sookie could be before she is jolted by Sookie's photokinesis.
Sookie then grabs a poisoned and pained Bill and quickly flees the house. After assuming that he has few clues about what Maryann might be, although he tells Sookie about some legendary creatures he read on a book years ago, he seeks advice from Sophie Anne, the Vampire Queen of Louisiana, on how to defeat Maryann. She tells Bill that the reason Maryann's blood poisoned him was because vampires could only feed on human blood and that a maenad is no longer even remotely human. Bill asks if she started out as human to which Sophie-Anne says she did, that even vampires started out as human, they simply evolved into what they are now.
Sophie-Anne reveals that Maryann's powers are directly tied to her beliefs. She tells him everything in the universe imagined itself into existence. Thus by believing in her god and becoming a maenad, Maryann was immortal. The only way to defeat her was to make her believe that Dionysus was ravaging her.
Back in Bon Temps, preparing to sacrifice Sam and using Sookie as a bridesmaid for Maryann's sacrificial ritual, Bill arrives with Sam in his custody and proposes a trade to which Maryann agrees. Sookie is horrified when a mind-controlled Eggs stabs Sam in the chest, but by reading Sam's mind she hears Sam telling her to destroy the egg and Maryann's statue offering to disrupt Maryann's ceremony. Sookie does so using her 'light' power for the second time.
An enraged Maryann starts sacrificing everyone around the yard by sending excessive amount of energy around her. When Sookie tells her to stop she begins transformation and starts pursuing Sookie into the woods, only to stop when she hears a growl. Suddenly she sees a large white bull coming towards, which she takes to be her god finally answering her summons. She is surprised when coming closer being moved by the situation, the bull suddenly impales her with one of its horns, asking if it means she is to be the final sacrifice to bring her god into the world. She accepts that her god wants her to die, thus dropping her immortality shield, and lets herself be ravaged by the bull, only to be shocked again when the bull morphs into a healed Sam who is ripping out her heart.
A distraught Maryann's last words are "Was there no god?"; Sam and Bill's deception had worked, as they had tricked Maryann into vulnerability. Sam then crushes her heart in his hand, causing her body to instantly decay into a skeletal, black corpse. Bill appears shortly after and reveals Sam had agreed to be stabbed if Bill would heal him after Sookie distracted Maryann. Sookie requests that Bill and Jason remove Maryann's body from the lot, explaining that she doesn't care where her body goes. ("Beyond Here Lies Nothin'")