'Full House' 25 Years Later: What You Never Knew About the Iconic Show

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.

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.