List of Dragons Riders Of Berk episodes
1 How to start a dragon academy
2 Viking for hire
3 animal house
4 terrible twos
5 in dragons we trust
6 Alvin and the outcasts
7 How to pick your dragon
8 Portrait of Hiccup as a young buff man
9 Dragon Flower
10 Heather report part 1
11 Heather report part 2
12 Thawfest
13 When lightning strikes
14 What flies beneath
15 Twinsanity
16 Defiant one
17 Breakneck bog
18 Gem of a different color
19 We are family part 1
20 we are family part 2
Season 2 - Dragons: Defenders of Berk
1. Live and Let Fly
2. The Iron Gronkle
3. The Night an the Fury
4. Tunnel Vision
5. Race to Fireworm Island
6. Fright of Passage
7. Worst in Show
8. Appetite for Destruction
9. Zippleback Down
10. A View to a Skrill part 1
11. A View to a Skrill part 2
12. The Flight Stuff
13. Free Scauldy
14. Frozen
15. A Tale of Two Dragons
16. The Eel Effect
17. Smoke Gets in Your Eyes
18. Bing! Bam! Boom!
19. Cast out Part 1
20. Cast out Part 2
Season 3: Race to The Edge
1. Dragon Eye of the Beholder part 1
2. Dragon Eye of the Beholder part 2
3. Imperfect Harmony
4. When Darkness Falls
5. Big Man on Berk
6. Gone Gustav Gone
7. Reign of Fireworms
8. Crushing it
9. Quake, Rattle, and Roll
10. Have Dragon will Travel part 1
11. Have Dragon Will Travel part 2
12. The Next Big Sting
13. Total Nightmare
You can watch these on Cartoon network, or the third season is on Netflix.