Does Cyclonic Rift's overload return tokens to hand or do they cease to exist?

When Cyclonic Rift is cast with overload, it returns all nonland permanents your opponents control to their owners' hands. Tokens are permanents on the battlefield, so they are targeted (well, affected) by the spell and are indeed returned to their owners' hands as the spell resolves.

However, tokens that exist in any zone other than the battlefield cease to exist the next time state-based actions are checked, per CR rule 704.5d: 'If a token is in a zone other than the battlefield, it ceases to exist.' This check happens immediately after the spell finishes resolving, before any player can take any action.

The practical result is that the tokens vanish — they do not stay in hand, they cannot be discarded for effects, and opponents do not 'have' them in hand for any meaningful purpose. The tokens simply cease to exist the moment state-based actions are checked after the Rift resolves.

Concrete example: Your opponent controls a 1/1 Goblin token and a Llanowar Elf. You cast Cyclonic Rift with overload. Both are moved to their owner's hand. State-based actions are then checked: the Goblin token ceases to exist, while the Llanowar Elf remains in hand normally.

This also means any 'when a creature enters the graveyard' or similar triggers do NOT fire for tokens removed this way, since they never reach the graveyard — they simply disappear from the hand zone (CR 704.5d).