If you want both English and Spanish subtitles at the same time (great for learning), use:

How to set up for free online series:

You’d be surprised. Channels like BBC Earth, National Geographic, Crime Central, and VICE upload full episodes of English series. Use YouTube’s auto-translate CC feature:

⚠️ Not perfect, but it works for simple dialogues.

Tubi offers thousands of hours of English series—from old BBC hits to cult classics. Many titles include Spanish subtitles.

Use these search strings in Google (replace "series name"):

"series name" ver online gratis subtitulada español
"series name" tubi español subtitulado
"series name" pluto tv on demand spanish subtitles

Example successful searches: