One can tell that he took his work in DS (both the series and the two movies) "dead" seriously. Which ever character he portrayed, he was him. Even when episodes and plots became, shall we say, "hokey" and he was in them, it was all acting business. He took the "hoke" out of the hokey and would save it all. He reminds me of Lucille Ball who played a homeless woman in the made-for-TV movie Stone Pillow. The film was actually dreadful (I'm not comparing it to DS, but let's say it took all the "bad" stuff spread throughout and DS and mashed it into one thing). But Ms. Ball lived her part and her acting was superb. She saved it.
Gerard