HTF: 28 day's later
Disclaimer: I do not own HTF nor 28 day's later I only own Skiddy.
A small lab in Happy Tree Town USA was near a medical breakthrough. Sniffles was working on a vaccine that would cure all types of cancer. Sniffles drew some of the 'cure' from its container and injected it in him as he had lung cancer. Soon, enough the lung cancer was cured but weird things began to happen. His eyes gained a reddish tint and his skin turned a light shade of blue. (All HTF's in this story are human's.) He was filled with an inexplicable rage and left out the door to find some victims.
With Disco
Disco was sleeping lightly on his bed snoring heavily. He woke up at the sound of a knock on the door. He walked over putting on his jacket and pants. He opened the door to see Infected Sniffles. Disco raised an eyebrow at Sniffles before getting bit on the shoulder by Sniffles and then tackled. Disco's screams were heard all around as Skiddy, Flaky, and Flippy gathered around Disco's house. They were all awoken by Disco's screams and looked inside. Inside the house was an Infected Disco and Sniffles. All 3 screamed and ran as soon as they spotted them. Skiddy and Flippy took harsh breaths to prevent themselves from Flipping Out. Another loud scream was heard as they saw Petunia get devoured by both. Skiddy couldn't take it anymore and Flipped Out. He grabbed his Franchi FAS and loaded it. He cocked the shotgun giving off an insane grin. He shot Sniffles twice dismembering him before Disco got away. Skiddy flipped back and told them to come with him. He also gathered Handy, Mime, Russell, and Pop and Cub to hide underground in his bomb shelter with him. Everyone grabbed a gun from a wall and loaded it. Flippy and Evil Flippy worked together for the moment. After Skiddy had explained everything loud pounding was heard on the door. Everyone pointed their guns at the door and Skiddy opened it sending the dead corpse of Shifty falling to the ground. A zombified Lifty walked in but was quickly shot down.
Skiddy gathered up enough courage to peek out over the top of the doorway to see Happy Tree town in ruins and infected everywhere. He closed the door and bolted it to prevent more from coming in. Skiddy walked over to the phone and called the army. "Who is this?" The voice on the other side asked. "Former Sergeant Skiddy." "What's wrong? Need a bombing?" "Our city's been infected by a virus referred to as by the survivor's rage sir." Silence was on the other side, "We're kind of busy with the virus itself as it has spread quickly across America and America is now quaran- AAAARRRRGGGGGHHHHH!" Skiddy quickly hanged up. "So?" Pop asked. Skiddy shook his head. "America's been quarantined." Pop's eyes rolled into the back of his head as an infected Flippy looked at Skiddy hungrily. Skiddy quickly pulled from behind him his shotgun and blew Flippy's head off. For extra measure he shot Pop in the head as well. Skiddy cried a little as he lost some of his friends. Flaky rushed over and saw what he was crying about. Skiddy watched as Cub crawled towards an infected Nutty. Skiddy's eyes widened when he saw Cub get swallowed whole. Skiddy had enough and flipped. He grabbed the two sub machine guns from the side of his belt and went crazy shooting. It went from trying to stay alive, to surviving the apocalypse.