The first episodes of every series are free, always, with no account needed. After that, three ways to keep going.
from $1.99
Pay for what you watch. Coins never expire.
An episode is 30 coins, rising to 60 across the final act. A typical series runs $18 to $21 to finish.
$4.99/month
1,500 credits a month, about 37 episodes.
This one can run out. If you watch most days you will reach the end of 1,500 credits inside a week, and Ultra is the better value at that point.
$19.99/month
Billed once a month.