Josh Underwood (played by Colton James) was the second son of Lisa and Doug Underwood. When their first son, Billy, returned ten years after disappearing having not aged a day, Josh and his father were very apprehensive. This was particularly true when Josh awoke to find Billy in his room with a knife. While driving out of town for a while and stopping for gas, Josh was kidnapped by Cal Jeppy. However, the investigation of Billy led Agents Scully and Doggett to Jeppy's property where they rescued Josh and discovered Billy's corpse, proving that the reappeared Billy was an apparition. (TXF: "Invocation")