Name That Episode (Reduex)

[Leonard T. Scott]

Restarting it because it kind of died. The rules are pretty simple, give a few clues to identify an episode or movie from Trek. Here's the first one:

A new captain takes commend while the old one goes on a secret mission. This was a two-parter.

[Malcolm Adeyemi]

The Chain of Command, parts I and II?

[Leonard T. Scott]

The Chain of Command, parts I and II?

Correct. You can throw one up if you'd like

[Malcolm Adeyemi]

An executive officer crash lands on a colony of former enemies and partially joins them...

[Leonard T. Scott]

An executive officer crash lands on a colony of former enemies and partially joins them...

Can I get the series?

[Malcolm Adeyemi]

Can I get the series?

VOY.

[Leonard T. Scott]

Repression?

[Malcolm Adeyemi]

Repression?

Nope. "Unity". 

[Leonard T. Scott]

Nope. "Unity". 

Ah, ok. I'm a little lacks on VOY.

An executive officer gets erased from history unknowingly

[Malcolm Adeyemi]

Ah, ok. I'm a little lacks on VOY.

An executive officer gets erased from history unknowingly

I'm trying to think which XO gets erased, but it has to be TOS, you're such a huge TOS fan, lol.

[Leonard T. Scott]

I'm trying to think which XO gets erased, but it has to be TOS, you're such a huge TOS fan, lol.

You are correct with the crew, however it's a TAS episode

[Malcolm Adeyemi]

You are correct with the crew, however it's a TAS episode

I'm stumped. I give up? lol. I've never seen any TAS at all...

[Leonard T. Scott]

Yesteryear. It's considered the best of TAS

[Malcolm Adeyemi]

Yesteryear. It's considered the best of TAS

Very cool.

A lifelong obsession to reunite actually drives a father and son apart.

[Leonard T. Scott]

Very cool.

A lifelong obsession to reunite actually drives a father and son apart.

Unification Part 1 and 2?