In Let's Open The Monster Heart!, Grace left the house due to her having a busy day. Mark looks at Grace's phone and noticed she had loads of email from JJ. Grace comes back for her phone and saw that Mark was looking through her phone so she does the same to him. When Ryan and Mark come out of Harper Futuristics, Grace thought they were following her. When Seth asks her on a date, she says yes to annoy Mark.
In Let's Be Idiots!, Grace and Seth came back from sushi and Seth offered Mark sushi, but he disagreed. Grace left the house so Seth and Mark could bond with each other. She came back and saw that Seth and Mark made their own Rat$z concert and she joined in.
In Let's Deal with Our Stuff!, Grace and Seth were at the game and Grace noticed that Ryan was acting differently to Mark. Seth told Grace that it was his fault and thanked him. At home, Ryan talked to Grace about his adoption and explained that she didn't know how to tell Ryan.
In Let's Destroy Some Ooze!, Grace got into the Northwest Food Fest by Ryan and Mark but came back shortly afterward when she heard what Mech-X4 did to Bay City High. Grace went to Harper Futuristics because she thought it was the safest place in Bay City. When Grace was with Seth, Mech-X4 were at Harper Futuristics and before it retreated, the robot looked back at her.
In Let's End This! Part One, Grace was with Seth at his office and Seth revealed that he was behind the monsters. Grace tried to escape, but Morris held her. Seth implanted a monster inside Grace's brain. Harris and Mark brought Grace to the Med Bay.
In Let's End This! Part Two, when Grace woke up, she went to the control room and saw who the pilots were. Harris, Spyder, and Leo left. Grace talked to Ryan and Mark and escaped to go to Seth's monster. Grace was with Seth inside the monster. They both got to Harper Futuristics and Ryan came in. Ryan tried to get the trigger from Seth, but Grace was the one who had it. Ryan convinced her that she could fight the monster inside her brain. Ryan bought Grace into Mech-X4. Grace was at the Med Bay and Leo was watching her so she doesn't find out who the pilots were. Grace woke up outside and Ryan and Mark were with her. The latest thing that Grace could remember was that Seth was behind the monsters.
In Versus The Deep, Grace left Ryan and Mark because she got invited to another Food Fest.
In Versus The Mountain, Grace came home and saw Mark and Leo on her roof. Grace questioned why they were there. They made an excuse which was that Leo was making a new satellite for them. Grace asked Leo to cut all the sports and movie channels because Mark's grades have been slipping.
In Versus The Tech Army, Davis bought Grace, Ryan, and Mark tickets to the Future Technology Explore. Davis got Grace music for the Future Technology Explore.
In Versus The Arctic, It was Grace's birthday. When Ryan told his and Mark's cover story, Grace thought they were buying a birthday gift for her. However, she reminded Ryan that they always ruined her birthday dinner.
In Versus Miami, Grace thought that Bay City wasn't safe due to monsters and Mech-X4. Grace was cooking in order of become an assistant chef in a restaurant in Miami. Grace was with Chrstph Frssll. Grace started cooking her first dish for Chrstph Frssll. Her equipment went haywire because of Ryan. When time was up, Grace thought that it wasn't good, but however, she was wrong. She made her final dish for him. Grace returned home to tell Ryan and Mark the good news. Grace was speechless when she heard that Ryan and Mark were pilots of Mech-X4.
Ryan is Grace's youngest and adopted son. She loves and cares for him deeply.
Mark is Grace's oldest son. She loves and cares for him deeply. In Let's Be Idiots!, he is seen to be protective of guys she dates, such as Seth Harper, possibly as a result of her and Mr. Walker splitting up.
Seth and Grace dated before. They first met in Let's Open The Monster Heart!, when a fire forced them and the rest of the employees, along with Ryan and his friends, out of Harper Futuristics. After Grace grounded Mark for snooping in her business, Seth took an interest in her and the two agreed to go out on a date. However, he later revealed to her that he's behind the monsters, and because of this, she lost interest in him.
Davis Walker is Grace's former romantic interest, revealed at the end of Let's Get The Big Bad! when Ryan found his adoption papers. It can be implied in Let's Open The Monster Heart! that he left Grace and remarried years ago.
- Her first husband Davis Walker remarried years ago.
- Let's Call It Mech-X4!
- Let's Open The Monster Heart!
- Let's Be Idiots!
- Let's Get Our Robot Back!
- Let's Deal with Our Stuff!
- Let's Destroy Some Ooze!
- Let's End This! Part One
- Let's End This! Part Two