Eventually, the Professor came back with a ship similar to the one-man stealth fighter, only this stealth fighter was bigger and could fit up to five people and when it turned invisible, from the outside, it made it look as though the people inside were invisible as well.
Zapp was going to infiltrate the alien's headquarters on Mars with this stealth fighter.
Before leaving, Gabe glared threatening over at Nibbler. Nibbler hissed and Gabe growled.
Awhile after Zapp had left with Kif and Gabe, Leela was still sitting with Nibbler. Fry had also walked over and sat with them.
"That alien of Zapp's is bad news." Nibbler grumbled.
"You know him?" Leela asked.
"I know he goes by Operative Gabe, he's apart of a crew made up of his species that travels the universe carrying out missions given to them by their government. I don't know him personally, no," Nibbler said, "but he is of a race of intelligent aliens who mostly use their intelligence and weapons for evil. Our superior race has been at war with theirs for centuries."
"What caused you to go to war?" Leela asked.
"Roughly nine hundred years ago, they tried to take over our planet. We drove them off, but a couple decades later, we met them in combat where they were helping the Brain Spawn." Nibbler explained.
"What do you think Gabe's doing with Zapp Brannigan?" Fry asked.
"I'm not sure," Nibbler said, "he probably has a scheme up his sleeve, he might be using him to get to something. However, I don't know what that something would be."
"Should we stop him just to be safe?" Fry asked.
"I'm just going to lay low until he does something worth stopping. Even so, I probably should contact my people just so they know where he is now." Nibbler said. "But if he comes around here asking for something, it's probably to get to me now that he knows I'm here."
...
Zapp was piloting the stealth fighter while Kif and Gabe sat beside him. Kif was holding onto a button.
"Sir, are you sure it's safe for just us to go alone without backup?" Kif asked.
"We have backup, it's called Gabe." Zapp said and patted Gabe on the head. "And of course if anything goes wrong, we can push that button to contact the others back on the ship."
Kif glanced at Gabe who sat close to him in the stealth fighter. Even though this ship was an improvement from the last one, it was still kind of crammed and he was uncomfortable being so close to the large alien.
Gabe looked at Kif, sensing he was afraid, but not sure of what. Gabe licked his cheek reassuringly, trying to make him feel better.
"Sir, it's tasting me!" Kif said becoming more paranoid. Gabe's head tilted.
"He just likes you," Zapp said.
They had entered Mars' atmosphere and the alien's headquarter was in sight.
"Where do we land?" Kif asked.
"Probably in that convenient opening in the roof." Zapp said, pointing towards it as he flew the stealth fighter into it.
They landed the small-ish ship once they flew down into the opening of the large building.
Zapp looked around, the coast seemed clear. Cautiously, he lifted up the top of the stealth fighter. He, Kif, and Gabe stepped out.
The stealth fighter remained invisible.
"Remember! Stay quiet, both of you," Zapp yelled loudly.
Kif sighed and Gabe's ears flattened.
The three of them quietly made their way down the large, dark corridor. Zapp held his gun and Kif was ready to push the button at any moment. Gabe had a blank, dull expression, but was fully alert. Gabe looked up and to the side with an ear twitch.
Out if nowhere, a horde of aliens rushed in and attacked them. Before Kif could push the button, they snatched it from him, and before Zapp could pull out his gun, the aliens took it as well. The aliens handcuffed them.
"I suppose you're back to try and stop us," Said the new lead alien, confronting Zapp and Kif.
"And we will. Gabe, attack-" Zapp was about to say and looked down, but Gabe was not there. Gabe had disappeared. "Well that's inconvenient, where did he go?" Zapp wondered aloud.
"Throw them in the jail cells," The lead alien said as the others took Zapp and Kif away.
Elsewhere in the building, Gabe walked towards a door and opened it. There were a ton of small ships in the room belonging to the aliens. Gabe had found the room no problem, as if knowing the building inside and out. Gabe walked up to a ship, opened it, and hopped in. Gabe knew exactly how to pilot those kind of ships, and after pressing a few buttons, the ship flew up and through a large, open window. Gabe flew the ship off of Mars and headed for Earth.