Air date: 12/17/85

Eager to prove that they are old enough for adult weapons, Wilykit and Wilykat sneak off with the adult Thundercats weapons for some practice. The Mutants seize an opportunity and the kids escape, but the weapons are now in the hands of the Mutants and the kids will have to confess to Lion-O what they did to gain his help in retrieving them.

Mumm-Rana

Air date: 12/18/85

After a space battle the Mutants' escape pods land next to a white pyramid. Inside they meet Mumm-Rana who is the good equivalent of Mumm-Ra. Mumm-Ra arrives and takes control of her to use her power against the ThunderCats.

The Shifter

Air date: 12/19/85

Vultureman builds a device that switches the consciousness of two beings and takes aim at the ThunderCats.

Fond Memories

Air date: 12/20/85

Mumm-Ra creates a 'living' museum of the ThunderCats' greatest enemies and traps Lion-O. But his most formidable enemy is one he's not yet fought.