Possessed by a "Grandma Voice," Cyborg initially endears the other Titans, but then he annoys them, acting as if he was their actual grandma.
Plot
The Titans start off in the city having a battle with Mother Mae-Eye. She attacks them all with her granny-like attacks until Cyborg claims that his own grandma was even better. Cyborg then interprets his grandma by altering his voice to sound like her. He easily fires off sonic blasts towards Mother Mae-Eye which scares her off into the distance. Starfire tells Cyborg has his voice is funny and Cyborg smiles wickedly.
Back at Titans Tower, the Titans (excluding Cyborg) are all tired of Cyborg's Grandma Voice by the time they reach the main lobby. Cyborg does not catch onto this and continues to role play his grandma. He claims that he got stuck doing the voice and cannot stop until Raven punches him to stop temporarily.
In the next morning, the Titans see Cyborg dressed up like his own grandmother with a wig making breakfast for them. Robin shocked, tells Cyborg to knock it off already but in terms of a grandmother that would lead to more sassing which the only way to get rid of it is by knocking some sense. Avoiding that, the Titans try to accept Cyborg as a grandma which they eventually get used with her after doing completing house chores while playing music and dancing. Grandma Cyborg made for them sweaters as a reward for helping her and Robin admits that he likes her too (for now). Later on, Beast Boy is playing video-games but he's being interrupted by Grandma claiming that he has homework to do even though Beast Boy doesn't even go to school and avoids from sassing. Starfire and Raven were about to leave the living room but they got stopped by Grandma due to Starfire's attire was showing some skin but Robin has nothing against it. From that sass he gets knocked with some sense out of the Tower, leading Starfire to get worried that knock was too rough for Robin. Raven amused, tries to avoid from laughing as well. She was all free from sass according to Grandma's Sass Detector.
After Grandma Cyborg left , the Titans are gathered up together thinking about a plan to bring Cyborg back to normal since they all started to get annoyed by her and even though they knew it is completely rude to hit old people (unless they are evil). For that, they managed to get captured by Mother Mae-Eye's trap in a pie making machine on purpose only for Grandma Cyborg to rescue them. During the battle against Mother Mae-Eye, Grandma Cyborg gets knocked with sense by her magical spoon, turning him back to normal as the Grandma Voice Ghost briefly waves at Cyborg telling him to take care of himself and fades away. Mother Mae-Eye tried to escape but she gets blasted out by Cyborg's Sonic Cannon and when he checks the Titans , Beast Boy was already full of cherry pie he ate.
Back at the Tower , Cyborg is crying for he miss his own grandmother voice but Beast Boy claims that she will be always with them in fond memory as he started to play again the same music they used for domesticities and all The Titans started to dance in the end, even Grandma Voice Ghost as well near her grave.
This is the second appearance of Mother Mae-Eye, with Billie Hayes reprising her role as Mother Mae-Eye from the original series.
The entire episode is an obvious reference to the original Teen Titans episode, "Mother Mae-Eye", which contains a very similar plot, except Mother Mae-Eye acted as the Titans' mother.
Furthermore, Mother Mae-Eye herself appears in this episode, adding yet another reference.