Help me out trekkies! which are good clic star trek episodes for me to introduce my 4.5 year old nephew to?

my nephew loves galazy quest and doesn't realize it's a parody of clic trek. Can you think of any clic trek episodes he might be able to watch? obviously not too much fighting with klingons ;) and not too much of capt. kirk's visits with green women ! (if that's even possible)