Original Wording
Possession: Give Deadman a power action and make a close combat or a ranged combat attack (as if he has a range value of 4) against an opposing target character as a free action. A successful attack deals no damage. Instead, remove Deadman from the battlefield and put him on his character card; the target is possessed, becomes friendly to your force and opposing to its owner’s force, and any of the target’s canceled powers return.

After the resolution of any action given to the target, you can release the target. Remove all action tokens from the target and place Deadman in any unoccupied square within 4 squares to which the target has a clear line of fire. The target becomes friendly to its owner’s force and opposing to your force.

If the target is possessed at the end of your turn, roll a d6 and add 1 to the result for each 100 points (or fraction thereof) of the target’s point value. If the result is 6 or more, the target is released. If the result is 5 or less, deal Deadman 1 unavoidable damage.

Each time the possessed target takes damage, deal Deadman 1 unavoidable damage after the action is resolved. Any effect that can counter the target’s powers can counter Deadman’s Possession. If Deadman is eliminated or Possession is countered or canceled, the target is immediately released. Deadman and possessed characters can’t be targeted by Mind Control or Possession. This power cannot be canceled.

Errata

(last paragraph only)

Each time the possessed target takes damage, deal Deadman 1 unavoidable damage after the action is resolved. Any effect that can counter the target’s powers can counter Deadman’s Possession. If Deadman is eliminated defeated or Possession is countered or canceled, the target is immediately released. Deadman and possessed characters can’t be targeted by Mind Control or Possession. This power cannot be canceled.

See the Possession entry for more information.