'Full House' 25 Years Later: What You Never Knew About the Iconic Show
Mary Kate Olsen and Ashley Olsen in "Greek Week"
During the run of "Full House," Mary-Kate and Ashley appeared onscreen together four
times. Perhaps the most memorable instance was in the Season 4 episode "Greek Week." In a Patty Duke-like twist, Mary-Kate took on the role of Melina Katsopolis, Michelle's look-alike cousin who was visiting from Greece.