“The Mighty B!” (10:30 a.m., Nickelodeon): Amy Poehler is a versatile performer, as she

“The Mighty B!” (10:30 a.m., Nickelodeon): Amy Poehler is a versatile performer, as she demonstrates weekly on “Saturday Night Live.” Still, she has a distinctive comic voice. If you don’t think so, tune in as she voices a kookie, irrepressible 9-year-old girl on the Nickelodeon cartoon, “The Mighty B!” Co-created by Poehler, this new series focuses on Bessie Higgenbottom, gung-ho leader of her local Honeybees scout troop (she wears her Honeybees uniform every day). On the first episode, Bessie adopts an equally spirited pooch so she can compete in the Honeybees-sponsored dog show. Then Bessie takes a long-awaited ride on the world’s most terrifying roller coaster — but only after proving she’s tall enough to gain admission. “The Mighty B!” is mighty silly, hyperactive and fun to watch (and not necessarily just by kids).

“Robin Hood” (9 p.m., BBC America): The mysterious bowman is back in the ’hood for another season.

“MADtv” (11 p.m., Fox): For those who have missed Dominic Monaghan ever since his character met his demise on “Lost,” take heart. He drops by “MADtv” tonight. Naturally, one of the sketches is a parody of “Lost.”