Michael Landon Jonathan Smith Creator, Actor Victor French Mark Gordon Actor Miriam Colon Anna Martinez Guest Star Gabriel Damon Bobby Martin Guest Star Janice Kent Penny Martin Guest Star John Lawlor Brad Guest Star David Spielberg Dr. Martin Guest Star Henry G. Sanders William Pierson Guest Star Vivian Bonnell Louise Guest Star Marlene Clark Rachel Pierson Guest Star Harry Waters Jr. Dr. Cooper Guest Star Richard Bergman Howard Spencer Guest Star Lawrence Braude Delivery Man Guest Star Ron Lanza Taylor Guest Star