Frost effects in the warehouse. All of the frost and ice are VFX.
FX industry blog Kunochan on Zoic’s contribution to the special effects in Ben 10: Alien Swarm:
“Orloff collaborated with Winter and Jacobs to turn the Big Chill from the cartoon, an Necrofriggian from the planet Kylmyys, into a 3D, realistic breathing character. Working with a model created by Hollywood, California’s Super 78 Studios, Orloff developed character and motion & flying studies for Big Chill before the filmmakers ever hit the soundstage.
‘It was very important to Alex [Winter] that we stay true to the original series, and give it a little something extra for the live action series that’s a real surprise for the viewers, to see their beloved cartoon characters finally brought to life,’ Orloff says.”
Read the full article on Ben 10 at Kunochan