It begins with the Platypus Alien superiors announcing the "guests" for the show, which are actually crossover characters. When they found out Splendid (their worst enemy) is in the casting, they brutally beat up the guests, including Splendid himself. When most of the guests were massacred, the Platypus superiors arranged the intact corpses into the title of that chapter (either on ground or nailed on a billboard). Flippy (one of the corpses) remains alive, until a laser blasts his head off, completing the title.
The Platypus Aliens launch a full-scale invasion on the British Isles. Josh tries whatever he can use to stop the aliens or outrun them. At then end, they caught up with him and eviscerate him. His guts spill out spell "SPECY", his blood forms "SPOOKTACULAR III PART:" and his rolling eyeballs show the Roman numerals.
But still, do you think the "title made of corpses and body parts" sounds good enough?
It is equivalent to the Mondo shows meatloaf (SS Part III) and the Object show book (SSII Part IV), except that this title (made of crossover character corpses and HTF body parts) is seen in its entirely, not in multiple slices/pages.
An HTF tries his/her luck on a Halloween-themed slot machine. The title is formed when he/she hits the jackpot.
Lumpy cooks up a pie and decides to cut it up. When he cuts it, spiders, cockroaches, maggots and ants all come out. They all enter Lumpy's head and makes him explode. The pieces of flesh splatter in the wall to spell the first section of the title. The blood forms the "PART:" and the insects form the Roman numeral
Another suggested intro would be Russell hunting for an undersea treasure called "the Golden Numeral" He later obtains the treasure, but then gets killed by an anchor. The golden Numeral is then dropped on the sea bed, where the sand blows away to reveal the title.
Is There a Doctor in the City?: Patriot finds a rather weird secret in one of the telephone boxes, while Devious and his thugs beat up the weakest citizens. A parody of both "Doctor Who" and "A Clockwork Orange"
Weird Weird West: Howdy discovers an abandoned Wild West village, which is inhabited by ghost bandits and undead villagers.
According to the revision history of Specy Spooktacular, you appear to be the original creator of the annual event. You don't mind if I list Specy Spooktacular III as an episode of The Happy Tree Friends Show this year, do you? I won't change it at all.
The only difference will simply be the fact it is listed as a HTF show episode. Also, concerning your departure: it's sad to see you go, but your reasoning is well. Besides, even if they do a new episode I bet the creators won't be working on that much more of the series before they completely stop working on HTF just for Zwak, and then the quality will probably decrease. I'm sorta just losing hope in the canon series.