Is it "serIS", or "ser-ES", for the word series?

I’ve been playing a video game ( The Hulk ) in which the main character says “series” but pronounces it as “seris”. It’s been really bugging me because I’ve always heard it the other way, but which way is actually correct?

it’s “-eez”, per Webster.

It is ser-EEZ, with a long E.

Check it out at dictionary.com