The hidden number...

1234567891011
Across
  1. 4. Peppa's Best Friend (smallest in group needs to fill this)
  2. 5. Loves summer, made of water, sticks and a carrot
  3. 7. She loved Pua and Hei Hei and the Ocean
  4. 9. Soda Pop
  5. 10. I'm going up up up
  6. 11. JJs Bro
Down
  1. 1. Never far from Hiccup
  2. 2. Simba's pop
  3. 3. Most famous transformer
  4. 6. Six Sevens are
  5. 8. Before he was Vader