Instead of leaping home as expected, Ben finds himself in 1978 aboard a top-secret military flight, transporting mysterious cargo; when the flight comes under attack, Ben and the crew discover the sobering truth behind their mission.

Ben takes on the role of a bank teller in the wrong place at the wrong time during a dangerous armed robbery; Addison, Magic, Ian and Jenn come to terms with a shocking discovery; the team adds a new member.

Now a government agent, Ben investigates unexplained extraterrestrial activity; after a mysterious incident in New Mexico, two young girls' lives are on the line; Ben meets Hannah Carson, who may be more than she appears.

Ben leaps into the body of an ambitious Hollywood assistant whose famous client, Neal Russell, is in danger; as Ben realises that Neal's circumstances may shed light on his own, his working relationship with Addison reaches an inflection point.

Ben lands in the body of an 18-year-old working for his father's shoe store in Koreatown in Los Angeles at the start of the explosive 1992 riots; facing an emotional connection in the riots to his past, Magic joins Ben on the leap.

At Princeton University in 1955, Ben must find a formula hidden by Albert Einstein that holds the key to nuclear energy before the Nazis get it; he's surprised to run into a familiar face on campus.