This is a parody of Jonny Quest, an action cartoon franchise that began in the 1960s. Like Jonny Quest, Jonny Hunt is about a family who gets involved in dangerous adventures.
This show is the fourth of many that Timmy Turner visits in "Channel Chasers", after wishing for a Magic TV Remote that allows him to travel through television as if the programs were real worlds. While inside the Jonny Hunt program, he helps Jonny and his family defeat a robot scorpion, earning their trust and the right to carry a dangerous weapon unsupervised. Timmy leaves the program and returns to the real world with the rocket launcher to show it off, but ends up accidentally blowing up the roof of his house and causing him to get in even more trouble with his infuriated parents after Vicky frames Timmy for vandalizing the Turner house with Mr. and Mrs. Turner still refusing to believe Timmy that Vicky is evil.
Later on in the special, Timmy Turner buries several photographs and items from his childhood in a Jonny Hunt lunchbox, as a time capsule, which his children Tammy and Tommy Turner dig up twenty years later.