Zoe Saldana recalled her experiences withStar Trekcostar Anton Yelchin on Mondays episode ofThe Late Show With Stephen Colbert.

He had just turned 18 when we met him.

So it was a terrible loss.

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Credit: CBS

Hes an irreplaceable person, and the kindest person.

He loved what he did.

After Yelchins death, Saldana posted atribute to her costar on Instagram.

Good bye, Anton, it was an honor to have crossed paths with you, she wrote.

It always sparks these amazing conversations at my house, she told host Stephen Colbert.

Take [Star Trek] creator Gene Roddenberry, for example.

And here we are, 50 years later, and it continuously inspires people.

Saldana reprises her role as Uhura inStar Trek Beyond, out in theaters on Friday.

Watch her discussStar Trekand sci-fi in the video below.