Loki: Agent of Asgard #15

Two versions of Loki face off against each other on this striking cover — an armored, older Loki wielding a spear and crackling with magical energy confronts a wide-eyed younger Loki dressed in a fur-trimmed costume, all set against a cosmic backdrop of planets and cavern rock. Bearing the "Last Days" and Secret Wars banners, this penultimate chapter of Loki: Agent of Asgard carries real weight as writer Al Ewing and artist Lee Garbett bring their run toward its conclusion. It's a visually charged sendoff for one of Marvel's most entertaining series of 2015.