The 84th episode of the prequel spinoff Star Trek: Enterprise airs on UPN. 
Trip is nervous about the arrival of Dr. Emory Erickson, the man who invented Earth’s transporter technology. Captain Archer is a little bit less in awe of the crotchety, wheelchair-bound scientist – Archer, Erickson’s daughter Danica and his son Quinn grew up together, their fathers both demanding pioneers. Erickson has gotten permission from Starfleet to conduct experiments in a new transport technique aboard the Enterprise, a breakthrough which Erickson claims could make star travel obsolete. But en route to Erickson’s destination coordinates for the experiment, something infiltrates the ship, killing a crewman. Erickson, who had previously conducted experiments in that region, says he’s never seen anything like it before. The phenomenon occurs again, and this time T’Pol records a visual record – a record which reveals that the roaming anomaly is, in fact, Quinn Erickson, who Archer thought had died in a transporter accident years ago. Erickson finally reveals that Quinn volunteered to be the first test subject for the long-range transporter, and was trapped in subspace, presumed lost. Erickson confesses that he thinks he’s made a breakthrough, something that will bring Quinn back, and over the senior officers’ objections he pleads with Archer to help him. And despite the fact that Quinn seems to leave a trail of death and destruction with each visit, Archer agrees.
written by Ken LaZebnik & Michael Bryant
directed by David Straiton
music by Paul BaillargeonCast: Scott Bakula (Captain Jonathan Archer), Jolene Blalock (Subcommander T’Pol), John Billingsley (Dr. Phlox), Dominic Keating (Lt. Malcolm Reed), Anthony Montgomery (Ensign Travis Mayweather), Linda Park (Ensign Hoshi Sato), Connor Trinneer (Commander Charles “Trip” Tucker III), Bill Cobbs (Emory Erickson), Leslie Silva (Danica Erickson), Donovan Knowles (Quinn Erickson), Noel Manzano (Ensign Burrows), and Porthos
LogBook entry by Earl Green