Star Trek episode "Tomorrow is Yesteray"

"Tomorrow is Yesterday"

Season 1, episode 19.

Weirdest start to a Trek episode as it starts with a 20th century USAF jet plane. Makes you wonder if you have the right show or not. Then you see the Enterprise and all is right.

They are on their way to Starbase 9 when a "black star with high gravitational attraction" causes them to be trapped. They break away like a rubber band, they say, and the whole Enterprise winds up back in the late 1960s.

Then the fun begins, as it was like they were filming this episode as they went without writing a script.

They beam the poor jet pilot aboard, Captain Christopher, then they talk about paradoxes with returning or not returning Christopher.

I'm sorry, Kirk messed up by beaming that pilot aboard. Spock should have shouted that possibility at the very least. He never should have put the jet into the tractor beam in the first place.

The Enterprise crew then decide they have to destroy the records of Captain Christopher--and they make it worse by beaming up a security guard!

The Slingshot Effect that is used at the end to send the Enterprise home is used again in Star Trek IV: The Voyage Home.

The thing about this whole episode I don't get is that the Enterprise crew beams the two 1960s Earthmen over their previous selves to fix the problems. What physics is this??

The 1960s Earthmen forget everything. This is an odd episode that had me scratching my head.