Fiskerton "Fisk" Saturday

Fiskerton is a seven-foot-tall "gorilla-cat" with glowing red eyes. He is one of the last of a legendary race of cryptids called "Fiskerton Phantoms" that was adopted by the Saturday family when he lost his home in Nottinghamshire, England. Although he is possibly the oldest (and largest) member of the Saturday family, Fiskerton is like an innocent kid brother to Zak. While he may be a scaredy-cat at times, when trouble is afoot, he is an agile and strong ally to have. He mostly talks in grunts and mumbling, but everyone seems to be able to understand what he means. He has also shown himself to be a decent pilot and driver in some episodes. In The Ice Caverns of Ellef Ringnes, Fisk lives up to the title of "Phantom" during a snowball fight with Zak in a blizzard, during which Zak can hardly see or hit him because as he said, "Hey, no fair, you're all camouflaged in this weather."

There is a drawing of a Fiskerton Phantom on the wall where Kur's tomb is in Cryptid vs. Cryptid. That same episode, Fisk proves to be a great fighter by taking down almost all the cryptids in cage matches with Doyle as his manager. However, he never gets to finish his fight with the guardian of Kur's Tomb, the Rakshasha.