Ensign Walsh was an engineer who worked aboard the NX class starship Enterprise during the vessel's search for the Xindi superweapon in 2153.
In an alternate version of 1944, Walsh assisted Commander "Trip" Tucker to repair one of the starship's shuttlepods, which had been damaged in an attack by a squadron of P-51 Mustangs. In order to repair the craft, the shuttlepod required a new EPS conduit. Tucker asked Walsh to retrieve a replacement conduit from the injector assembly in Engineering. (ENT: "Storm Front")
- Played by actor Duncan K. Fraser.