The Time Tunnel (1966) : 1x4

Tony and Doug land in the Japanese Consulate in Honolulu on December 6, 1941, and see three men burning files. They talk their way out and Tony goes to find his father, who disappeared during the bombing. Cmdr. Newman is initially skeptical, but Tony convinces him with family knowledge no one else could know. The Japanese agents get wind of Tony and Doug's knowledge, capture the pair, and interrogate them for information. They don't break, and manage to escape. Meanwhile, Cmdr. Newman is at Naval HQ checking out Tony's warning, and the Project staff realize that if the young Tony (who was also present at Pearl Harbor) isn't rescued, then ""their"" Tony will vanish. Tony manages to convince the housekeeper, Mrs. Neal, to flee to the mountains with her child and Tony, and then he goes to rescue his father. They head to Naval HQ but a barrage hits and Cmdr. Newman is killed. An unexploded bomb lands, and the Project staff use the Tunnel to delay it long enough for the travellers to get clea