I Was Bitten (2008)

S4E4 The Bad News Ghouls

Following a crushing defeat by Mindy's baseball team, Grim steps in to coach Billy's squad. However, Billy is hesitant to include girls, not recognizing that Mindy is one as well. Undeterred, Mandy disguises herself as "Manfred" by donning a baseball cap and joins the team in secret. With support from eerie players from the Underworld Little Leagues under Grim's guidance, Billy's team ultimately triumphs when Pud'n smashes a home run, securing their victory.