Eddie Murphy is trying to destroy a young comedian's career because he's vain -- at least that's what Brando Murphy claims in his defamation lawsuit against the star.

Brando is suing Eddie for a whopping $50 million after the legend accused the younger comedian of trying to pass himself off as Eddie's son. In the suit, Brando takes a swipe at the Nutty Professor star, saying, "The name Murphy is of Irish decent...and not exclusive to Eddie Murphy, a 'Black Man' of African Ancestry and a purported African American."

Though he appeared in the stage act Sons of Comedy alongside the son of Richard Pryor, Brando denies trying to pass himself as Eddie's son. Brando blames a higher power when it comes to him resembling the actor, writing, "[I] did not create [myself] and that the way [I] looks is an act of GOD."

Eddie previously had his attorneys send Brando a cease-and-desist letter, which the younger Murphy called "vile, base, contemptible, miserable, wretched and loathsome."

Eddie's lawyer, Marty Singer, tells TMZ, "This is an absolutely ridiculous lawsuit, and we are confident it will be immediately dismissed by the court."