In 1998, Cartoon Network's seventh original cartoon, The Powerpuff Girls, premieres. This also shows some updates for this channel, such as Powerhouse and new introduction sequences given to the packaged theatrical shorts.
The Dexter's Laboratory episodes "Dexter's Lab: A Story/Coupon for Craziness/Better Off Wet" premiere.
February[]
4[]
The Dexter's Laboratory episodes "Critical Gas/Let's Save the World You Jerk!/Average Joe" premiere.
11[]
The Dexter's Laboratory episodes "Rushmore Rumble/A Boy and His Bug/You Vegetabelieve It!" premiere.
18[]
The Dexter's Laboratory episodes "Aye Aye Eyes/Dee Dee and the Man" premiere.
25[]
The Dexter's Laboratory episodes "Old Flame/Don't Be a Hero/My Favorite Martian" premiere.
March[]
2[]
Cartoon Network acquires the broadcasting rights to Batman: The Animated Series from Kids’ WB and begins airing it.
The branding of the network transitions from Starburst (with the Checkerboard bumpers) to Powerhouse. However, the bumpers and promos from the Checkerboard and Starburst eras are still used until April.
4[]
The Dexter's Laboratory episodes "Paper Route Bout/The Old Switcharooms/Trick or Treehouse" premiere.
11[]
The Dexter's Laboratory episodes "Quiet Riot/Accent You Hate/Catch of the Day" premiere.
The Dexter's Laboratory episodes "Dad is Disturbed/Framed/That's Using Your Head".
25[]
The Dexter's Laboratory episodes "DiM/Just an Old-Fashioned Lab Song.../Repairanoid".
April[]
1[]
A sneak preview of Beetlejuice airs from 6:00 AM to 6:00 PM.
The Dexter's Laboratory episodes "Sdwarkacb/The Continuum of Cartoon Fools/Sun, Surf and Science" premiere.
6[]
The Bugs and Daffy Show was given a new introduction sequence, made exclusively for the network. Unlike the original intro sequence featuring the stalk Looney Tune characters appearing in front of the Checkerboard background, this new sequence is fully animated.
8[]
The Dexter's Laboratory episodes "Big Bots/Gooey Aliens That Control Your Mind/Misplaced in Space" premiere.
15[]
The Dexter's Laboratory episodes "Dee Dee's Rival/Pslyghtly Psycho/Game for a Game" premiere.
22[]
The Dexter's Laboratory episodes "Blackfoot and Slim/Trapped with a Vengeance/The Parrot Trap" premiere.
29[]
The Dexter's Laboratory episodes "Dexter and Computress Get Mandark!/The Justice Friends: Pain in the Mouth/Dexter vs. Santa's Claws" premiere.
May[]
6[]
The Dexter's Laboratory episodes "Dyno-Might/LABretto" premiere.
June[]
1[]
Cartoon Network acquires the broadcasting rights to the Japanese anime series Sailor Moon and begins airing it on the Toonami programming block.
15[]
Season 2 of Dexter's Laboratory ends with the episode "Last But Not Beast," which served as the series finale until the series returned in 2001.
Cartoon Network acquires the broadcasting rights to the Japanese anime series Dragon Ball Z and begins airing it on the Toonami programming block, leading to great ratings success.
September[]
7[]
Tom and Jerry was given a new introduction sequence, made exclusively for the network. The backgrounds were CG animated while the characters are in 2D animation.
October[]
24-25[]
Cartoon Network airs a 25 hour marathon of Scooby-Doo, titled Those Meddling Kids: 25 Hours of Doo, in 24 hours thanks to the Daylight Savings time change which added an extra hour to the day.
