Protector II (not to be confused with Protectors), is an original arcade game that was available on several platforms (Commodore 64, Atari 400/800). Loosely based on the arcade smash Defender, the game was much more complicated. You have to rescue 20 humans and defend yourself against various aliens, after launching from your start base. There are various areas to the terrain, including the city that the humans are all in, standing on skyscrapers. After playing a bit, a volcano explodes, and a lava flow starts toward the city... so, you have to rescue all of the humans before the city is over run with lava. You have to unblock a teleporter tube, and drop the humans off there one by one before the lava completely overflows the city, and at that point you can actually win the game.
Protector II is probably the best example of the rarely used Semigraphics 24 mode that only the Coco 1 and 2 (not the 3) had; it mixed the built in text font with all 9 semigraphics colors, and even created the waving humans out of mixing scanlines of the text characters (the mode is 64x192x9). The game was a little hard to control without a self-centering joystick, but it was quite fun to play, and graphically very impressive.
There is some confusion between the naming of the Tom Mix Protectors game and Protector II, even by it's own title screen. Since the original Protector II on the other platforms was itself a sequel to a game from 1981 called Protector, and Tom Mix came out with Protectors before the Coco port of Protector II was done, the game was called Protector in the screen credits, but Protector II in the ads and on the software box.
Title: Protector II
Author: Robert Black (original Atari version by Mike Potter)
Publisher: Synapse Software
Released: May 1983
Requires: Color Computer 1 or 2 ONLY, 32K RAM, cassette or disk, joystick.