Learn Russian: Этот фильм плохой.

In Russian, when you say "This is a movie," you use the fixed neutral word это (Это фильм). But when "this" attaches directly to a specific noun (as in "this movie"), it acts like an adjective and must match that noun's gender. Since фильм is masculine, we use the masculine form Этот.

How do I know фильм is masculine?

You can usually tell a Russian noun's gender by its last letter. Words that end in a consonant, like the м in фильм, are almost always masculine. Because of this, everything describing it in the sentence (Этот and плохой) must also be in the masculine form.

Where is the word for "is" in this sentence?

Russian doesn't use a present tense verb for "to be" (like "am", "is", or "are"). You simply put the subject (Этот фильм) and its description (плохой) right next to each other.

Why does the adjective плохой end in -ой instead of the usual masculine ending -ый?

Most masculine adjectives end in -ый or -ий, but when the spoken stress (the vocal emphasis) falls on the very last syllable of the word, the ending changes to -ой. If you listen to a native speaker say плохой, you will hear the emphasis placed heavily on that final syllable.