The unnamed Narrator in Cartoon Network Punch Time Explosion is voiced by Space Ghost's Cartoon Network era voice actor George Lowe, with dialogue implying that the character is indeed Space Ghost. Reportedly, this is the result of the game’s developer being denied usage of Space Ghost in the game, but deciding to sneak him into the game, in as much as they could, regardless.
This information is important context for the game's story mode, where the narrator observes multiple Cartoon Network series facing apocalyptic conditions that were eventually revealed to be brought on by Space Ghost's tv remote control (that he claims he purchased discounted from a “store that sells discount borscht by the gallon”); that somehow ended up a violent android with multiverse threatening powers. Space Ghost manages to defeat his tv remote by summoning Captain Planet without Gaia’s rings, which he does by invoking elemental associations held by a number of Cartoon Network characters and a fart joke, and Captain Planet is able to defeat the Remote Control.