Zoe Saldana shared memories of her late Star Trek co-star Anton Yelchin during her appearance on Monday's The Late Show With Stephen Colbert. Honoring the young actor, who died after a car accident last month, Zoe said:

“He had just turned 18 when we met him. He was the youngest one of the crew, and I almost feel like he was the wisest one. So it was a terrible loss. We’re mourning. He’s an irreplaceable person, and the kindest person. He loved what he did. I’m here today, and the rest of the cast and J.J. [Abrams] and Justin [Lin], we’re here promoting the movie mainly for him, because he would have wanted that.”

The actress went on to explain how films like Star Trek have changed lives:

“It always sparks these amazing conversations at my house. Whenever we talk about shows like Star Trek—like, because Barack Obama mentioned being a fan of the show, that maybe this was one of those shows that really inspired him to believe that maybe he could actually be president of the United States of America.”

Zoe's appearance follows co-star Zachary Quinto's tribute to Yelchin this month, which was also on The Late Show. Earlier this week, Yelchin's parents took an ad in The Hollywood Reporter to thank fans for their unconditional support. It reads: "To all of you who have sent flowers and gifts, for your condolences and kind words...we are deeply grateful for your unconditional love...he would be surprised at how many hearts and souls he touched."

Star Trek Beyond hits theaters July 22, and will mark Anton Yelchin's first posthumous release (he plays Pavel Chekov) since his tragic death. Ahead of its premiere, click here for our complete guide to the film.