The fifth season of Johnny the Oval premiered on August 1, 2003 and ended on January 29, 2005.
The production began in late 2002 until early 2003. The production of the show now has new sound effects and new locations and all characters are redesigned.
- Johnny's Bouncy Fun/Johnny Finishes the Job/Johnny Digs a Hole (1.8. 2003)
- Johnny's Windy Day/Holly's Lost Rabbit/Lucy's Valentine Card (30.8.2003)
- Johnny Wants to Fly/Johnny's Moon Adventure/Holly Sleepwalks (17.9.2003)
- Johnny Goes Snowboarding/Holly's Balloon/Like Father, Like Son/Johnny and the Knitting Machine (6.5.2004)
- Johnny Gets Lost/Johnny and Holly's Camping Adventure/Johnny's Balancing Act (7.7.2004)
- Smelly Johnny/Johnny and the Band/Johnny and the Snowball/Johnny Sticks Up (1.1.2005)
- Johnny and the Doorbelll/Johnny Plays Tag/Johnny's Pancakes/Johnny's Bedtime Shadows (29.1.2005)
Season 5 and 6 weren't released on DVD. They were released as part of Johnny's Platinum Collection on May 5, 2010 worldwide however. It was also released on iTunes Store.
- Devon Starr as Johnny the Oval
- Andrea Libman as Holly the Oval
- Nicole Dove as Johnny the Oval's mum
- Tom Kenny as Johnny the Oval's dad and Additional Voices
- Bill Faggerbake as Johnny the Oval's grandfather
- Tara Strong as Sammy and Tommy the Oval and Additional Voices
- Ashleigh Ball as Jimmy and Timmy the Oval
- Kath Soucie as Lucy the Oval and Additional Voices
- Dave Lib as Mr. Morry and Big Clown
- Candi Milo as the seagull and Additional Voices
- Dee Bradley Baker as Additional Voices
- Jim Cummings as Additional Voices
- Billy West as Additional Voices
- Jeff Bennett as Additional Voices
- Grey DeLisle as Additional Voices
- Eric Bauza as Additional Voices
- Kathryn Cressida as Additional Voices
- Kari Wahlgren as Additional Voices
- This is the first season to be produced by Cartoon Network Studios.
- Christine Cavanaugh and Alison Moore (the voices of Johnny and Holly) were replaced by Devon Starr and Andrea Libman due to their retirement.
- Grey DeLisle, Eric Bauza and Kari Wahlgren joined the cast of Johnny the Oval.
- This is also the first season to use digital ink and paint.