In their first series, Tundra was Alpha Flight's first big nemesis. Pun intended. A member the pantheon of dark gods, The Great Beasts, Tundra and his brethren were continual adversaries of Alpha Flight. I've always enjoyed the simplicity of Tundra's menace: vaguely humanoid in shape but he could grow large enough to crush a city, if Alpha Flight wasn't there to stop him. All apologies to John Byrne.
{8x5.33, created in Adobe Photoshop}