What actors and actresses appeared in The Forest - 1982?

The film "The Forest" you're referring to is likely the 1982 film titled "The Thing in the Forest" (also known as "The Forest" in some regions).

The main cast includes:

* Robert Powell as David Morelle

* John Hurt as Harry

* Carole Bouquet as Cathy

* Tom Bell as Jack

* Patrick Magee as Inspector

* Bryan Marshall as Harry's father

Please note that there are a few other films with titles similar to "The Forest" that were released around the same time, so it's important to clarify which film you're asking about.