The Don't be my Valentine marathon was a special 9-hour UltraToons Network marathon that aired on Thursday, February 14, 2013 (Valentine's Day) from 8:00am to 5:00pm. The marathon featured episodes of Cartoon Cartoons such as Dexter's Laboratory, The Powerpuff Girls and Ed, Edd n Eddy that dealt with unrequited love. As well as the Johnny Bravo special "It's Valentine's Day, Johnny Bravo".

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