Zombies (Happy Tree Friends)

Seen in Remains to be Seen, they are the dead bodies of the trick-r-treaters that flipped-out Flippy ran over, in addition to Flippy himself. They most likely rose from the dead because of the nuclear waste in the back off Flippy's truck. They rose from their graves and attacked Lumpy, the grave digger. Zombie Flippy managed to bite Lumpy's arm off, causing it to turn into a zombie limb. Lumpy jammed a leaf blower in Flippy's head, causing his brain to swell up. When zombie-Toothy bit the brain, the brain exploded, "killing" all the zombies (except The Mole) and burying them again. After the zombies were all dead and Lumpy it was all over, his severed hand attacked him. Characters that got zombified are Flippy, Cuddles, Giggles, Toothy, Sniffles, The Mole, Handy, Petunia, Lifty, Shifty, Russell, Mime, Nutty and several Generic Tree Friends. Lumpy was partially zombified when his severed arm came back to life.

The zombies seemed to have a craving for living flesh, except, possibly for zombie Flippy, who simply wanted to mutilate Lumpy, as he had bitten off Lumpy's arm and spat it out to keep going for him. The zombie Happy Tree Friends sound and move like traditional zombies: slowly and clumsily with a constant moan; most likely due to the radiation decaying their bodies, natural decay if they had been dead a while before rising, or possibly a combination of both. Zombie Flippy is another exception to the main horde, he is far more aggressive, dexterous (similar to a Crimson Head from the Resident Evil series), and doesn't moan like the other zombies, he laughs maniacally. The reason behind his better movement from other zombies, in terms of story, is this is how Flippy is expected to be, to set himself out from others; however, from a logical standpoint, it may be possible that his better movement may be down to the aggression he possessed just before he died (think of it as "running on adrenaline"). Another point about zombie Flippy is he is also far more intelligent than the other zombies, such as stealing Handy's lower body to chase Lumpy more effectively, and acknowledging that Lumpy's choice of a leaf blower was a very poor choice. However, he was careless in his attacks, and as a result the leaf blower would actually cause his demise as a zombie.