Star Trek: The Next Generation - Season 4 Episode 8 -

The Enterprise is conducting a security sweep in an area near the Neutral Zone when they are probed by what Captain Picard thinks may be a secret Romulan base. Commander Riker, who has just had a birthday, leads an away team composed of Geordi and Lt. Worf when they are overcome by methane gas. He awakens in Dr. Crusher's sick bay to be told that he is now Captain of the Enterprise - and his last memory of being on the methane gas planet occurred 16 years ago. Dr. Crusher tells him he's been in a coma for 10 days as a result of an attack of encephalitis which has also...