General Information
Director: Don Richardson
Writer: Robert Hamner
Cast: Guy Williams, June Lockhart, Mark Goddard, Marta Kristen, Billy Mumy, Angela Cartwright, Jonathan Harris, Fritz Feld, Richard Krisher, Eric Matthews, Edy Williams, and Carroll Roebke
Composer: None (Stock Music)
Air Date: 12/13/1967
Production #: 1515
Overview
In order to evade capture, four intergalactic thieves disguise themselves as human tourists and brainwash Mr. Zumdish into acting as their guide. Upon arriving 
on the planet currently occupied by the Robinsons, the aliens are accommodated by Dr. Smith, who, without permission, transforms the Jupiter 2 into a luxury hotel.
“Two Weeks in Space” is marred by the antics of Will, Dr. Smith, and the Robot. For this reason, Lost in Space fans of a serious nature would be wise to avoid this effort.
Pros
When the alien imposters roam the Jupiter 2 at night, stock footage of a full moon is played along with the howling of a wild animal—a combination that creates an eerie, atmospheric setting reminiscent of a black-and-white horror film by Universal Studios.
Cons
Though necessary for the events of Robert Hamner’s narrative to unfold, the Robinsons’ decision to leave Dr. Smith—a buffoonish, incompetent man—in charge of the Jupiter 2 is never explained.
Also problematic is the copious amount of slapstick violence featured in this episode, which often parallels that of a typical Three Stooges short. For example, Smith is repeatedly bonked on the head with a shuttlecock, prompting Non (Edy Williams), an alien posing as an attractive human female, to comfort the good doctor—a comedic device that will likely appeal to only the youngest of Lost in Space fans.
Analysis
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Concluding Comments
Combining low-brow humor with a tired series trope (i.e., a beautiful woman seducing Dr. Smith, who responds in a strangely apathetic manner), “Two Weeks in Space” may evoke criticism from viewers. This episode does, however, benefit from an eerie sequence in the first act.
Overall Quality: 3/10
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This is my number twenty-three ranked episode for the psychedelic and far out, all over the place, highly inconsistent and relatively overrated, shortest final colored season..
Although I consider this episode to be my second worst of the entire series, it can be entertaining. At least, much more so than the previous episode. This episode has some cringe worthy embarrassing scenes, but it has some good stuff as well. This is easily the worst (and the last) of the trio of the Mr. Zumdish entries. Really, Mr. Zumdish was not even needed. I think they just made an excuse to build an episode around his character.
As usual as well, this one is a bit far-fetched. Again, I thought it was so much better in the 1970s. Alas, it has dropped and dropped in the rankings through the years. It is still fun though..though ridiculous.. :-]