John Carter, Warlord of Mars #28 - Oct. 1979

"The Weapon-Makers of Mars!" by Peter Gillis, Larry Hama, and Ricardo Villamonte.

This final issue of John Carter, Warlord of Mars opens up with a new storyline, a new writer, and a new artist:

Kantos is attacked, and his scream is heard by John Carter. Carter and some of the men search for him, but the trail leads to a dead end. Or does it?

Turns out the wall is a false one, and some explosive charges blast a hole in it, leading to a secret underground lair. Carter and some of his men take an elevator down many stories, into a vast chamber filled with all sorts of high-tech equipment.

Carter feels some mental vibrations which he believes are coming from Kantos. They follow that feeling across a bridge, into a room, and:

...and with that abrupt ending, Marvel's John Carter series comes to a close, save for a third annual, which we'll cover next. Be back in two days!