HP

Character playing this Special is KO'd and a KO'd hero is returned to the Front Line immediately. Any hits from Current Battle or on Permanent Record of the character playing the Special are now considered Hits in the same locations on the character returned to play. No other cards are returned to play. This Special may only be played on a player's turn. It may not be played during an opponent's turn. This Special does not need to be played during the battle that a character is KO'd

Meta Rules
Meta #32 If conditions are such that the card cannot be played this battle unless the opponent performs some action, then the card must be placed or discarded as unusable. If the player holds cards that can create the situation by which the card would be playable, then it can be kept in hand.

Meta #153 Specials which can make other cards (Specials, Power cards, etc.) usable allow you to keep those unusable cards in hand during the discard phase. The Special to make them usable must be available (e.g., Placed, in Hand, available through a specific draw - not through a random draw).

Non-Meta Rule Information
Cards which are already in play (from this battle or previous battles) on the character remain in play after the switch. The teammate swapped might have been K.O.'d for many battles prior to playing the Special.