Find out who the surprise guest was during today's special tribute episode of "General Hospital" dedicated to the late John Reilly and his character, Sean Donely.

Kimberly McCullough will reprise her role as Robin Scorpio on Friday, May 21 as part of the "General Hospital" on-air tribute to the late John Reilly who portrayed Sean Donely on the soap. She isn't the surprise guest, however.

ABC has scheduled the long-awaited special tribute episode of "General Hospital" dedicated to the late John Reilly (Sean Donely). Find out when to watch, who'll take part, and what to expect.