Third Culture Kids (TCKs) represent a group of youth who have lived overseas with their families for business, service, or missionary work. The implications of living in multiple cultures, especially during the developmental and formative years of youth, warrant investigation. This study informs the US counseling community about the characteristics and issues common among American TCKs and adult third culture kids (ATCKs) from previous generations. It begins with an explanation of the TCK situation; the history of their experiences; their living conditions; and how their own culture develops. Common TCK themes are identified such as change; relationships; worldviews; cultural identity; as well as basic TCK characteristics and issues. A review of the literature considers possible ATCK counseling needs. ATCKs may feel they do not fit into any one culture. Others express feelings of rootlessness, alienation, and unresolved grief. The need exists for counselors to help both young and older adults understand their experiences of growing up in a different culture. (Contains 25 references.) (JDM)