Selected scenes from Nickelodeon’s first original telepic, “The Journey of Allen Strange: Alien Vacation,” based on the Nick sci-fi series, is a vacation adventure for the earthbound alien (Arjay Smith). With an “E.T.”-esque storyline as a foundation, “Strange” appeals to the universal kids’ fantasy of befriending an alien and helping in his search for a way to return to his native planet. With Eugene Levy and Beverly Johnson.