Arthur is excited about a brand new computer game called "Deep Dark Sea". Specifically, the goal of the game is to find "the thing," which if done, he'll win the game. Eager to do this, he spends all the time he can, but doesn't actually make it before bedtime, so he saves his game. The next morning, Arthur invites Buster over, but can't use the computer since Mrs. Read is working on it. She tells them they are not allowed to touch it after taking a trip to her office. She says, "I need to run to the office. And don't touch my computer". But Arthur is both too anxious and he chooses to play the game anyway. When they come across a treasure chest, and find out it's the "thing" they were looking for, they get excited by jumping for the computer fighting over the mouse, and inadvertently knocking the keyboard off the desk, causing the screen to go blank. Then, the phone rings. Arthur calls his mom. Mrs. Read says on the phone that she is not going to come back until tonight. Then she asks Arthur if everything is OK. Arthur responds, "Fine. Just great". D.W whispers to Arthur that Mom can tell if he is lying. Arthur then says "Goodbye" and tells himself that they can fix the computer before Mom comes back home. Since turning the computer off and on again didn't solve the problem, they run through the manuals looking for a solution. But it turns to be no help. So (after Buster tells the Brain that he can fix anything and suggests they should ask him), Arthur and Buster decide to look for the Brain. They think that he might know the solution. When Arthur and Buster look for the Brain at his house, his mother tells them that he is not home. First they check the library; then they check the museum. After searching for a long time, they finally see him at the pond (skipping rocks at the stream). Everyone goes back to Arthur's house (Arthur, Buster, and the Brain). At Arthur's house, the Brain examines the computer. But he turns out to be no help either (he can't find the problem). And then, as a final resort they go to the computer store asking for a solution to fix it. He explains his problem to the computer expert. Then the computer expert explains how much a house call and hourly fees cost. So because of that, the fees for fixing are too high. Then Arthur says to himself that it might be more birthday money than he ever would see in his whole life. D.W (when clicked on by the user) says, "We're all doomed! Because now, Mommy is going to lose her job! And we are not going to be able to live in the house! So we all have to live in the cold and on the street! And we're all going to get pneumonia and probably die! And it's all your fault, Arthur!". Then Arthur says, "I'm doomed!". That evening, Mrs. Read comes home before they can fix it as a result. Arthur is too nervous to talk to her. Then, when Mrs. Read heads to the computer, Arthur gets sick. Then Arthur runs after Mrs. Read. Arthur runs after her, followed by D.W who runs after Arthur. Buster runs home. Later, in the computer room, Arthur desperately tries to keep her away from the computer. Before Mom's finger is about to hit the power button of the computer, Arthur yells "STOP!". He says, "I was playing Deep Dark Sea. And the screen went blank! I'm sorry. I wrecked it. It's all my fault". He is eventually forced to admit his mistake. Mrs. Read says that it happens to her all the time. Then asks him, "Did you jiggle the switch?". She jiggles the switch and then the game comes on. Mrs. Read asks Arthur why he didn't call her in the first place and says that he should always call her with his problems. Arthur says he thought she would be mad. But Mrs. Read says she is disappointed; but not mad. Arthur asks if he is going to get punished and Mrs. Read says "Of course, you did something you weren't supposed to do". Then D.W. tells Mrs. Read to make the punishment "really good". Mrs. Read (to D.W's comment about making the punishment good) tells Arthur that he can’t play any computer games for a whole week. She says, "No computer games for a week". Then she tells Arthur to go get ready for bed and then she will be up to say goodnight in a few minutes. But instead of getting back to her work, she ends up trying the game out. When Arthur and D.W. are already for bed, she decides to play Arthur's game; Deep Dark Sea. Arthur and D.W do as they are told. Then when they call Mom to tuck them in, Mom (who is now playing Arthur's game; Deep Dark Sea) says "In a minute. The sharks are attacking". D.W suggests that she and Arthur should tuck themselves in tonight; to which Arthur replies "Good idea". Mom tells them she will be right up as soon as she blasts the skeletons from the treasure chest. But finally, Arthur and D.W (now they are in bed; as they've tucked themselves in) both say "Goodnight" to Mom.
