Sailor Moon (1992)

S2E7 Where O Where Did Olie Go / Gone Dog-Gone Dog / A Chip Off the Old Orb

During a play session, Olie accidentally flies his Space Boy Space Explorer into his dad’s Magnatron, causing himself to shrink. Meanwhile, Spot gets hit by the device and grows to an enormous size, then swallows the Magnatron whole. Now both Olie and his dad are tiny. They must find a way to get mom’s attention so she can help them return to normal size.