Canada
USA
A businessman (Donald Sutherland) has a hotshot young new partner (William McNamara). What he doesn't realise is that his new partner is the son of his second wife, adopted into an abusive family at birth and now a raving psychopath out to murder his natural mother for whom he blames the miseries of his lifetime. - IMDb
| Besøk av fienden |  Norway |
| Ehthros ek fyseos |  Greece |
| Enemigo natural |  Spain |
| Enemigo natural |  Mexico |
| Der Feind in meinem Haus |  West Germany |
| Le fils maléfique | Canada |
| Hate | West Germany |
| Inimigo por Natureza |  Brazil |
| Inkräktaren |  Sweden |
| Natural Enemy |  United Kingdom |
| Natural Enemy - Der Feind in meinem Haus | West Germany |
| Természetes ellenség |  Hungary |
| Uno sconosciuto in casa |  Italy |
| Veren vihollinen |  Finland |
| Wróg naturalny |  Poland |
| Естествен враг |  Bulgaria |
| Тайный враг |  Russia |
| 同居人 背中の微かな笑い声 |  Japan |
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Michael Caloz [11] | Young Jeremy |
