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Marybeth March is a girl who made her only speaking appearance in Operation: S.I.X..
On her 10th birthday she asked Numbuh 2 to deliver some soda (illegally) to her party at a pizza place. She was lying about that however, and at the end of the episode she left with the Delightful Children From Down The Lane and their birthday cake, revealing she had been forced to trick Hoagie into smuggling the cake for them.
She is seen in several episodes in the background at Gallagher Elementary, first appearing in Operation: F.U.T.U.R.E. at the boarding school Wallabee went to. She was the first person on the bus to see the Six-Gum Gang approaching in Operation: R.O.B.B.E.R.S..
- Her name Marybeth may be a nod to Macbeth, a Shakespearean character also noted for betraying those around him to gain a higher title.