I used to watch Soap in the 1980s, but did not realize Seagren was there. Also I don't recall a character called Dennis Phillips, just the Fletchers and Tates and the pseudo-Burt from outer space. Perhaps Dennis's role was one of the minor ones? Of course, it was a long ago, and my memory is not so good, even though I remember more important things such as Kjell Isaksson's and Seagren's rivalry with the pole vault WR in the early season of 1972.
I am happy I was finally able to fulfill my dream and answer correctly to one of your birthday quizzes! Yesterday evening (it was evening here) I was too sleepy to think of the Olympic champion with the same initials, but you must mean Barbora Špotáková, even though strictly speaking our birthday hero isn't Bob Šeagren, is he?:-)