
Carlo De Mejo was the son of musician Oscar De Mejo and actress Alida Valli who enjoyed her greatest period of international success right after Carlo's birth in the later half of the 1940's. Carlo followed his mother into acting, first as a child actor and then as an adult, appearing in mainstream films such as The Cassandra Crossing but mainly making a name for himself in several early 80's Italian B-movies for Lucio Fulci, Luigi Cozzi, and Bruno Mattei.

Terror Express
1980 · as Ernie

The Cassandra Crossing
1976 · as Faux Patient

Women's Prison Massacre
1983 · as Lawman Harrison

The House by the Cemetery
1981 · as Mr. Wheatley

City of the Living Dead
1980 · as Gerry

Theorem
1968 · as Lucia's first lover

The Outside Man
1972 · as Karl

Cindy's Love Games
1979

Contamination
1980 · as Agent Young

I fobici
1999 · as Party guest (segment "Frutto proibito")

Dirty World
1978 · as Massimo

Paura: Lucio Fulci Remembered - Volume 1
2008 · as Self

The Dead Are Alive
1972 · as Igor Samarakis

Stateline Motel
1973 · as Albert

William Shakespeare's Twelfth Night
1979 · as Orsinio

Tales from the Rails
2009 · as self

Al limite, cioè non glielo dico
1984

The Net
1975