5 of the 6 have non-sentinent creatures that try to kill one of the heroes.
Ep1. Oksee Killer and stamped of forest creatures
Ep2. Killer Centipede things, Aklay, Nexu and Reek.
Ep3. None
Ep4. Garbage Compactor creature
Ep5. Wampa and Space slug
Ep6. Rancor and Sarlac Pit Monster