Lost in Space: 1x21
The Magic Mirror
Penny and Judy stumble upon a mirror. They discover someone is on the otherside. Before they know it they are transported to the mirror universe which is occupied by only one person, a boy who is lonesome for companionship.
1 - 1The Reluctant Stowaway Sep. 15, 1965
1 - 2The Derelict Sep. 22, 1965
1 - 3Island in the Sky Sep. 29, 1965
1 - 4There Were Giants in the Earth Oct. 06, 1965
1 - 5The Hungry Sea Oct. 13, 1965
1 - 6Welcome Stranger Oct. 20, 1965
1 - 7My Friend, Mr. Nobody Oct. 27, 1965
1 - 8Invaders from the Fifth Dimension Nov. 03, 1965
1 - 9The Oasis Nov. 10, 1965
1 - 10The Sky Is Falling Nov. 17, 1965
1 - 11Wish Upon a Star Nov. 24, 1965
1 - 12The Raft Dec. 01, 1965
1 - 13One of Our Dogs Is Missing Dec. 08, 1965
1 - 14Attack of the Monster Plants Dec. 15, 1965
1 - 15Return from Outer Space Dec. 29, 1965
1 - 16The Keeper (1) Jan. 12, 1966
1 - 17The Keeper (2) Jan. 19, 1966
1 - 18The Sky Pirate Jan. 26, 1966
1 - 19Ghost in Space Feb. 02, 1966
1 - 20War of the Robots Feb. 09, 1966
1 - 21The Magic Mirror Feb. 16, 1966
1 - 22The Challenge Mar. 02, 1966
1 - 23The Space Trader Mar. 09, 1966
1 - 24His Majesty Smith Mar. 16, 1966
1 - 25The Space Croppers Mar. 30, 1966
1 - 26All That Glitters Apr. 06, 1966
1 - 27The Lost Civilization Apr. 13, 1966
1 - 28A Change of Space Apr. 20, 1966
1 - 29Follow the Leader Apr. 27, 1966