broke his elusive tendencies and appeared on his family's show to discuss a matter close to his heart ... conspiracy theories about aliens.'s only son made a rare appearance on Thursday's episode of"The Kardashians" ... as he joined taping for the show via a phone call to back up sisterCheck it out ... the family got on the topic of aliens while discussing the viral Miami moment, where conspiracy theorists claimed aliens visited a mall in the Sunshine state.
though mom Kris Jenner was left unconvinced. Khloe chose to call in some backup ... as she had Rob voice his beliefs for the table -- and the cameras.Later on in the conversation, Rob shared his theory that aliens have been on planet Earth since at least the 40s. RK found support in Kris' boyfriend,Corey's passion for aliens left Khloe a little suspicious that CG may be an alien himself ... which Kris quickly shut down in a confessional.