Slugterra: Ghoul from Beyond (2014)

Plot

After the defeat of the nefarious Dr. Blakk, Eli Shane finds a moment of respite as Slugterra's protector. However, peace is short-lived when a terrifying new threat surfaces from beyond the 99 caverns, challenging Eli and his team. As they confront this emerging evil, the stakes rise, testing their courage and teamwork. Eli must rally his friends and harness the power of their slugs to face this unforeseen menace, reminding everyone that true heroism often comes when least expected.