It had a different storyline than the episode of the same name.

A supercomputer used in the episode of the same name.

In the Florida library, there is the book titled To Serve Man from the episode of the same name.

This world is based on the episode of the same name.

(adapted from the episode of the same name written by Frank Lupo)

Ten years later, he leaves the church as a missionary, and takes passage on the transport Serenity (as seen in the episode of the same name).

(See the episode of the same name.)

This is an updated version of the earlier episode of the same name.

The hitch-hiker from the episode of the same name appears on the playfield, and as a collectible bonus.

Also, the chorus of the song has the lyric "Live together, die alone", which is a reference to the episode of the same name from the series.