Plot: As the gang travels through a desert landscape, a dust storm kicks up and soon a strange turn of events unfolds. A UFO seems to swoop down and hover over the Mystery Machine, which causes the gang to pull over and visit the nearby town, to figure out what is going on. Soon after they arrive, Scooby-Doo and Shaggy are abducted by some aliens and afterward, wake up and meet a beautiful girl named Crystal and her pooch Amber. As soon as Shaggy sees Crystal, he falls head over heels and the two embark on a light romance, including a musical interlude. With the van in need of repairs and a mystery afoot, the gang decides to stick around and look into the potential aliens, but what will they uncover?

Entertainment Value: This is one of the stranger, more off the beaten path feature length Scooby-Doo adventures, but I like Alien Invaders and I think the weirder vibe adds to the fun. The “How Groovy” musical routine is memorable, for better or worse, but even if you hate the song, the romance element is a nice inclusion. After all, we don’t see much character development over the course of these mysteries, so even a light change of pace is welcome. I know some Scooby-Doo fans dislike Alien Invaders because the mystery aspect is rather minimal and that is a fair critique, as that isn’t a main focus of the narrative. But the eventual reveal is a trippy one and there’s a fun nod to the usual unmasking of some crooked villain, so while the mystery is thin, the core elements remain at least referenced. Alien Invaders is indeed a basic Scooby-Doo adventure, but it has enough quirkiness to keep things brisk and fun.

This movie marked the last time Mary Kay Bergman performed as Daphne, which adds a sad tinge to Alien Invaders. Scott Innes is here as Scooby-Doo and Shaggy, Frank Welker voices Fred, and B.J. Ward rounds out the main cast as Velma. The writing is a little shaky for Velma, Fred, and Daphne in this one, but given the focus on Shaggy and his romance, that makes a little sense. Candi Milo has a fun role as Crystal, while Jennifer Hale, Jeff Bennett, and Kevin Michael Richardson have good efforts here as well. Mark Hamill brings some star power to Alien Invaders and even has one of the best lines, about those meddling kids and all. The animation is rather basic, but in line with the other Scooby-Doo DTV movies of this time period. A few scenes pack an extra punch, such as the colorful and memorable musical routine, but for the most part, the visuals are simple, but effective. Alien Invaders isn’t one of the best DTV Scooby-Doo mysteries, but fans of the series should have fun here.

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