Binding of Isaac: Rebirth Wiki

Added in Afterbirth †

Extension Cord is an unlockable trinket added in The Binding of Isaac: Afterbirth † (Booster Pack #4).


  • Bolts of electricity arc between Isaac and his familiars, damaging any enemies between them.
    • The bolts do 6 points of damage per strike.
    • The bolts flow through each familiar in reverse order of acquisition, and reach Isaac last.
    • A bolt arcs every 2 seconds with one familiar. 3 of them arc per second with two familiars. 7.5 per second with three or more familiars.


  • The Forgotten The Forgotten acts as a familiar while controlling The Soul The Soul, causing electricity to arc between them. Added in Repentance The same applies for Tainted Forgotten Tainted Forgotten and Tainted Soul Tainted Soul.
  • Does not affect temporary familiars.
  • The bolts will damage destructible obstacles, such as TNT TNT and Fire Place Fire Places, as a normal tear would.
  • Added in Repentance If taken as Jacob and Esau Jacob and Esau, electricity will arc to familiars held by both characters, not just the familiars owned by the character holding it. It will also arc between Jacob and Esau, even if neither have any familiars.
  • Added in Repentance In co-op mode, electricity will arc to all of them, similar to Jacob and Esau. Their familiars will also be connected.


  • Extension Cord: Holding two copies or golden version of this trinket, or having Mom's Box Mom's Box has no effect.

In-game Footage[]



  • Extension Cord is based on this Steam Workshop mod by Strawrat and CupertinoEffect, which was originally a passive collectible.


Bug Bug! Removed in Repentance When using BBF BBF, electricity will arc to its last location before exploding, until it respawns.
Bug Bug! Removed in Repentance When Holy Water Holy Water breaks, the sprite is temporarily stored just off the top-left of the screen, toward which electricity will still arc.