Currently available on 2 streaming services.

Streaming, rent, or buy Adventure Time – Season 1:

Currently you are able to watch "Adventure Time - Season 1" streaming on Max, Netflix.

Cast

Jeremy Shada
Finn the Human (voice)
John DiMaggio
Jake the Dog (voice)
Tom Kenny
Ice King (voice)
Hynden Walch
Princess Bubblegum (voice)
Olivia Olson
Marceline the Vampire Queen (voice)
Niki Yang
BMO / Lady Rainicorn (voice)
Pendleton Ward
Lumpy Space Princess (voice)
Polly Lou Livingston
Tree Trunks (voice)