Yesterday, I saw an episode of Stranger Things.

I watched one of the last episodes from the series.

I already watched the series but I watched it again to improve my English comprehension.

So, in the episode, El (Eleven), one of the main characters, was in the lab with her "Papa" likeas she called him (he's not really her father because he just putedtook her from her mother's hands when she was born because she is special and she has talent) and she losted her power so "Papa" tried to make her power come back.

And for that, she had to come back into a memory which iwas very difficult for her because he thinks it'ought it was the only way.

Her memory was with other "special" kids who wasere called withby numbers (like 1 or 10 for example) and she was bullied by the other kids.

"kids" are plural so it's "were" instead of "was"

And, sShe was friendly with a man who showed her how to escape.

But El didn't want to kill preople so she fioughted against him and she sendt him into another world: the upside down.

Thanks foor your correction.

Yesterday, I saw an episode of Stranger Things.

I watched one of the last episodes from the series.

IEven though I’ve already watched the series but, I watched it again to improve my English comprehension.

Replacing “but” with “even though” and moving it accordingly is more natural.

So, in the episode, El (Eleven), one of the main characters, was in the lab with her "Papa" like she called him (he's not really because he just puted herwhat she called her "Papa". (He’s not really. He just took El from her mother's hands when she was born, because she is special and she has talent) and sheShe’d losted her power so "Papa" tried to make her power come backrestore it.

Beware run on sentences! Don’t forget to break up ideas with periods (.).

And forBecause of that, she had to come back in a memory, which is very difficult for her because . But, she thinks it'’s the only way.

Is it difficult *because* she thinks it’s the only way, or is that just additional information?

Her memory was shared with other "special" kids who was callere each named with numbers (like 1 or 10 for example) and s; She was bullied by the other kids.

Use the semicolon (;) to break up two independent but related ideas.

Andlthough, she was friends with a man who showed her how to escape.

Use “although” to present information in spite of previous information, like El having a friend despite being bullied by the kids.

But peopleHowever, the other kids(?) found them and t. The man was actually a special kid too, (he was called 1) and he killed every body in the lab.

If you can specify which group of people rather than just saying “people” it adds some clarity to the sentence.
I added a question mark in parenthesis because I haven’t seen stranger things and am not sure if those are the people who found them.
A comma after “too” lets the following “and” act as a coordinating conjunction, which connects the dependent clause to the independent clause.

But El didn't want to kill propleanybody so she fioughted against him and s. She sendt him into another world: the upside down.

Thanks foor your correction.