"It's no surprise that the majority of laughs are ably captured by Fillion, showing off the knack for deadpan delivery previously tapped by Joss Whedon in Serenity. As Pardy, he fills out the role of an unlikely hero dealing with extraordinary events, bringing bumbling affability to a part that could so easily have been lost to square jaws, steely eyes and other clumsy stereotypes. Tipping its hat at everything from the original Puppet Masters to bargain-bin trash like Ted Nicolaou's TerrorVision, Slither is a carefully crafted parody (the Predator nod in particular will bring a smile to your face). But this is the scalpel to the Scary Movie series' bludgeoning sledgehammer, skirting cheap imitation in favour of affectionate irreverence and managing to produce a genre hybrid that's far more than the sum of its pilfered parts." - James Dyer, Empire Magazine