Can I Keep It? - S1.E8

After avoiding a flash flood, Seattle finds a kitten-like creature that she names Flotsam. It gets into their food supplies and grows substantially...and grows some more. All efforts to train him seem in vain and it looks like the team will have to leave him behind. Da'kyll and his Tlak'kahn mercenaries show up and Flotsam gives warning by playing ""fetch"" with a grenade. A simlar flash flood wipes out the Tlak'kahn and Seattle agrees to leave Flotsam behind.