Hmm, toughie indeed! I would say from when the gang was locked in by the Sheriff until they drove into the sunset, LOL!
Seriously, I liked:
1. "The Dog Dies" scene. (
The Creeping Creatures)
2. When they find the yearbook with the original Mystery Incorporated. (
The Legend of Alice May)
3. When the gang first meets Professor Pericles. (
Howl of the Fright Hound)
4. When Scooby teams up with Pericles, but for a good reason, to save Crystal Cove from the love spell casted by Aphrodite. (
Where Walks Aphrodite)
5. "I am Nightfright! Scream! Scream! Time for you to die!" (
Nightfright)
6. When Velma finds out and tells Angel that she's really Cassidy Williams (
The Siren's Song)
7. When Mr. E is revealed - I was really shocked by his resemblance to Ricky Owens, but I wasn't sure until the season 1 finale. (
Menace of the Manticore)
8. All of episode 23. (
A Haunting in Crystal Cove)
9. All of episode 26. (
All Fear the Freak)
10. All of episode 27, but mostly Crybaby Clown's speech - reference to Mano Tiki Tia and Readbeard. (
The Night the Clow Cried)
11. When Mr. E tells Marcie AKA Hot Dog Water that Mystery Inc's days are (gulp) numbered! (
The House of the Nightmare Witch)
12. The airplane scene. Fred's bravery really amazed me, and Scooby and Shaggy were great at keeping Crybaby Clown busy. (
The Night the Clown Cried II - Tears of Doom!)
13. The return of Brad Chiles and Judy Reeves.
Web of the Dreamweaver!)
14. The original Mystery Incorporated meeting. (
The Hodag of Horror)
15. Scooby's singing, really funny! (
Art of Darkness)
16. The Graveyard Ghoul and Pericles scenes. (
The Gathering Gloom)
17. Fernando El Aguirre's ghost appearance saying "Nibiru" and then laughing evily while turning to skeleton and disappearing. (
Night on Haunted Mountain)
18. "Don't judge me because I'm beatiful!" - Scooby dressed like Daphne. (
Grim Judgment)
19. All of episode 36, so similar to
The Shining I loved it! (
Night Terrors)
20. All of episode 37., the Kriegstaffebots, along with the Freak, Crybaby Clown, the Evil Entity and the Monstrous Freak were my favorite villains. (
The Midnight Zone)
21. The DVD scene, like most of us, as well as the putting together of the Planispheric Disc. I first thought the took Nova just to put together the last piece, but appearently, Fred put 2 of them. (
Wrath of the Krampus)
22. All of episode 40, Blue Falcon and Dynomutt were a wonderful addition to the show, I wish we could see them more often. (
Heart of Evil)
23. Friar Serra coming to life to warn the gang, I think that was the scariest ghost that talked about Nibiru. After watching this episode, Dr. Coffin and the Ghost Clown were like cuddly and playful puppies in comparison to the Friar. (
Theater of Doom)
24. When the gang finds Primero Llave, the first key. (
Aliens Among Us)
25. The Horrible Herd stampede. (
The Horrible Herd)
26. The band battle and Nova waking up to say "Nibiru. Nibiru is coming". The moment I heard her, I couldn't sleep. (
Dance of the Undead)
27. The super-sized showdown and Pericles saying "First, we steal the Planispheric Disc from the kinder, then... we destroy them!" (
The Devouring)
28. "Welcome to the sitting room, Cooby-Doo". (
Stand and Deliver)
28. All of episode 47, parody of
Twin Peaks. (
Nighmare in Red)
29. When the gang find the spear, the Heart of the Jaguar. (
Dark Night of the Hunters)
30. All of episode 50. (
Gates of Gloom)
31. All of episode 51. (
Through the Curtain)
32. All of episode 52. (
Come Undone)
But if I had to choose one of the above it would be... hmmm, I can't choose!