Episode 405 is Gerry Anderson's The Investigator 

The Investigator, a benevolent alien from a distant galaxy, selects an Earth boy and girl, John and Julie, to assist him in his mission to make their world a better place. The pair are miniaturized to assist The Investigator more easily, and assigned to prevent the theft by Stavros Karanti of a 14th century masterpiece from a church on Malta. John and Julie are presented with a car and a boat, scaled to accommodate their miniaturized size, and set out to thwart Karanti's plans..

Episode 404 is Gerry Anderson's Into Infinity (1975)

The crew of the lightship Altares are lost in space when the craft is struck by a meteor shower and goes out of control.

Also know as "The Day After Tomorrow"

Episode 403 is Hammer House Of Horror (1980)

"Witching Time"

The ghost of a witch returns to her place of residence before she died, a rural farm, and possesses one of the current occupants.

Episode 402 is Smallville (2001)

"Pilot"

Baby Kal-El lands on earth and is found by the Kents. Kal-El is named Clark by Jonathan and Martha and tries to live a normal teenage life. This is somewhat of a challenge given his developing abilities. He becomes fast friends with Lex Luthor after saving Lex's life. Same plot used as the aired pilot except for some extension to certain scenes and Cynthia Ettinger portraying the role of Martha Kent before Annette O' Toole takes her place for the rest of the series.

Episode 401 is Supergirl (2015)

"Pilot"

Twenty-four-year-old Kara Zor-El, cousin of Superman, who was taken in by the Danvers family when she was 12 after being sent away from Krypton, must learn to embrace her powers after previously hiding them.

Episode 400 is Here Come The Double Deckers !(1970)

"Tiger Takes Off"

The gang try and build a hovercraft though disaster strikes when Tiger gets trapped in it and ends up being chased all over town.

Episode 399 is Battlestar Galactica Part 3 (1978)

Episode 3

After the Twelve Colonies of Mankind were destroyed in a sneak attack by the Cylon tyranny, the last Battlestar Galactica leads a makeshift fugitive fleet on a desperate search for the legendary planet Earth

Episode 398 is Battlestar Galactica part 2 (1978)

Episode 2

When the fleet stops at the planet Carillon to refuel and pick up supplies, a newly-elected member of the Council seizes power from Commander Adama.

Episode 397 is Battlestar Galactica (1978, part one)

Episode 1 part 0ne

When the Cylons trick the human fleet and destroy all its ships except the Battlestar Galactica, Commander Adama gathers up the remaining humans from the 12 colony worlds and leads them in search of the legendary 13th colony: Earth.

Episode 396 is Bonanza (1959)

"A Rose for Lotta"

Lotta Crabtree is hired by mining tycoon Alpheus Troy to lure one of the Cartwrights into town and hold him for ransom in exchange for Ponderosa timber rights.