"The Trouble With Toddlers"

The USS Phoenix and their partner ship, the USS Jubilant Grace, came across a seemingly abandoned Iconian ship. Upon scanning it, the unmanned ship fired an unknown weapon, turning their crews into their seven-year-old equivalents, their memories after that age being wiped. With no adults to help them, a de-aged Parlac called his cousin Naom Orrek, the Cardassian ambassador to the Federation. She eventually put them through to someone in Starfleet who guided the children to reactivating the weapon and restoring the crew back to the correct ages. The weapon was revealed to be an embarrassingly failed effort by the Iconians to create a chroniton weapon so powerful it could de-age enemies back into a zygote. Oops.