Back-Up is an attack that serves as Zoom's Level 1 Smack Attack in Toshiko Smackdown. Zoom summons either Footbot, Mac, Sarge, Doc, or Pappy, who will perform an attack.
Each of the five possible characters performs a different attack, but they have the same basic range of attack. Because of this, players don't have to be prepared for five completely different attacks. All of the attacks kill opponents in front of Zoom, a maximum of five character lengths away. The attacks are as follows:
- Footbot: Footbot fires a Shock Rocket that explodes after traveling a short distance. It will also explode if it hits an opponent or wall.
- Mac: Mac dashes forward and performs a devastating uppercut that kills opponents he hits.
- Sarge: Sarge calls down an Airstrike that strikes five character lengths away, killing anyone caught in the blast.
- Doc: Doc opens a Wormhole that sucks in and kills any opponents in front of Zoom.
- Pappy: Pappy rides forward on his Minebot, running down opponents in his way.