First aired: Apr/09/1955
Director: Herbert L. Strock
Guest star: William Lundigan (Fred Gunderman), Bruce Bennett (General Troy), Tom Drake (Dr Everett), Ellen Drew (Helen Gunderman), Basil Ruysdael (Dr Carson), Douglas Kennedy (Colonel Barton), Michael Fox (Radar Man)

First aired: Apr/16/1955
Director: Jack Arnold
Guest star: Marie Windsor (Nell Brown), Warren Stevens (Ted Heller), Peggy O'Connor (Ann Heller), Don DeFore (Al Brown)

First aired: Apr/23/1955

First aired: Apr/30/1955
Director: Leon Benson
Guest star: Judith Ames (Edna Miner), Louis Jean Heydt (Col Van Dyke), DeForest Kelley (Captain Hall, MD)

First aired: May/07/1955

First aired: May/14/1955
Writer: Robert M. Fresco
Director: Jack Arnold

First aired: May/21/1955
Writer: Hendrik Vollaerts
Director: Leslie Goodwins
Guest star: Robert F. Simon (Damon), Michael Fox (Dr. Franklin)

First aired: May/28/1955
Writer: Jerry Sackheim
Director: Jack Arnold

First aired: Jun/04/1955
Guest star: Virginia Hunter (Paula Kennedy)

First aired: Jun/11/1955

First aired: Jun/18/1955
Director: Leigh Jason

First aired: Jun/25/1955

First aired: Jul/02/1955

First aired: Jul/09/1955
Writer: Norman Jolley
Director: Leigh Jason

First aired: Jul/30/1955
Director: Leigh Jason
Guest star: Michael Fox (Dr. Gordine)

First aired: Aug/06/1955

First aired: Aug/13/1955

First aired: Aug/27/1955

First aired: Sep/03/1955
Guest star: Phyllis Coates (Karen Sheldon)

First aired: Sep/10/1955

First aired: Sep/17/1955

First aired: Sep/24/1955
Guest star: John Stephenson (Dr. Brewster)

First aired: Oct/01/1955

First aired: Oct/08/1955

First aired: Oct/15/1955

First aired: Oct/22/1955
Director: Leigh Jason
Guest star: Gary Marshall (Bobby Tyler)

First aired: Oct/29/1955

First aired: Nov/05/1955

First aired: Nov/12/1955

First aired: Nov/19/1955
Director: Alvin Ganzer

First aired: Nov/26/1955
Writer: Richard Tuber
Director: Tom Gries

First aired: Dec/03/1955
Guest star: Joan Vohs (Kyra Zelas)

First aired: Dec/10/1955
Director: Alvin Ganzer

First aired: Dec/17/1955
Guest star: Raymond Bailey (Professor)

First aired: Dec/24/1955

First aired: Dec/31/1955

First aired: Jan/07/1956
Director: Jack Arnold
Guest star: Olan Soule (Mr. Wilkins)

First aired: Jan/14/1956

First aired: Jan/28/1956
Writer: Richard Tuber, Robert M. Fresco
Director: Eddie Davis

First aired: Apr/07/1956

First aired: Apr/14/1956

First aired: Apr/21/1956

First aired: Apr/28/1956
Director: Tom Gries

First aired: May/05/1956

First aired: May/12/1956

First aired: May/19/1956
Guest star: Bradford Jackson (Steve Morris), Bradford Jackson (Steve Morris), Michael Fox (Dr. James Kinkaid)

First aired: May/26/1956
Guest star: Francis McDonald (Professor Bernini)

First aired: Jun/23/1956

First aired: Jun/16/1956
Guest star: Stafford Repp (Professor van Doorne), Michael Fox (Dr. Maxwell)

First aired: Jun/23/1956

First aired: Jun/30/1956

First aired: Jul/07/1956
Writer: Peter R. Brooke
Director: Herbert L. Strock

First aired: Jul/21/1956

First aired: Jul/28/1956

First aired: Aug/18/1956
Guest star: Bradford Jackson (Jim Harris), Bradford Jackson (Jim Harris)

First aired: Aug/25/1956

First aired: Sep/15/1956
Guest star: Michael Fox (Dr. Norsted)

First aired: Sep/22/1956
Guest star: Ed Kemmer (Joe Castle)

First aired: Sep/29/1956

First aired: Oct/06/1956

First aired: Oct/13/1956
Director: Tom Gries

First aired: Oct/20/1956
Writer: Joel Rapp
Director: Tom Gries
Guest star: John Stephenson (Inspector Mark Davis)

First aired: Nov/03/1956

First aired: Nov/10/1956

First aired: Nov/17/1956

First aired: Nov/24/1956

First aired: Dec/01/1956
Writer: Tom Gries
Director: Paul Guilfoyle
Guest star: Michael Fox (Dr. Edwards)

First aired: Dec/08/1956
Guest star: John Stephenson (Phil Coulson)

First aired: Dec/15/1956

First aired: Dec/22/1956

First aired: Dec/29/1956
Writer: Peter R. Brooke
Director: Eddie Davis

First aired: Jan/05/1957

First aired: Jan/12/1957

First aired: Jan/19/1957

First aired: Jan/26/1957

First aired: Feb/02/1957
Writer: Meyer Dolinsky
Director: Eddie Davis

First aired: Feb/09/1957

First aired: Apr/06/1957
Writer: Meyer Dolinsky
Director: Herbert L. Strock