The Mysterious 25 Hours of Doo Logo
The Mysterious 25 Hours of Doo was a special Scooby-Doo, Where Are You! marathon that aired on Cartoon Network from 6:00 AM, Saturday October 29, 1995 to 6:00 AM, Sunday October 30, 1995. During the marathon every episode of Scooby-Doo, Where Are You was aired.

In the promos leading up to the marathon, viewers were told to send in a letter guessing how Cartoon Network would air 25-hours of programming in just one day. As it turned out, October 29, 1995 was the day the clocks moved back one hour for Daylight Savings, meaning an extra hour was added to the day. If the viewer guessed correctly they had a chance to win a copy of Scooby-Doo Mystery for either the Sega Genesis or Nintendo.


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