Echidna is an ally to Team Nefarious, and a non-Dark Spawn Lady of Monsters and Demons. She is the Mother of All Monsters and wife of the monstrous Titan Typhon. As her title suggests she is the mother of every horrifying monster that appeared in the Hercules animated series.
She has not appeared yet in the Spongebob/Spyro series to battle the Shell Louge Squad, and is currently labeled as unconfirmed, but alcourse If he wants to find clips for Echidna, Scroopfan can check the episodes Hercules and the Bacchanal, Hercules and the First Day of School, and Hercules and the Return of Typhon. a thing he might do as soon as he has the time.