The Hard Stop

 is the sixth episode of the fourth season and the sixty-third overall.

Synopsis
The episode opens up again at the Zanzibar fortress as Tucker and Caboose are attempting to teach English to the Alien. Church and Tucker get into a small debate on whether they should teach the alien English or learn his language. Tucker is convinced that they should teach English to the Alien and even had created some visual aids. As it turns out, Tucker was able to get the writing supplies from Caboose's gun which apparently contained crayons instead of bullets. However, when Tucker activates his energy sword to cut the poster boards, the Alien jumps over and attacks him. Despite Tucker's cries for help, Church watches the Alien as it attacks Tucker in order to "evaluate" his fighting style.

Back at Blood Gulch, Simmons is at Blue base with Sheila close by. He attempts to contact Red Base, but is greeted with Donut on the line, who tries to impersonate an answering machine. Simmons attempts to get Sarge on the line, but Donut, under instructions from an off-screen Sarge, denies Simmons from communicating with Sarge, even after he informed Donut that he had captured the Blue Base and Sheila. Eventually Donut hangs up on Simmons, but not before letting Simmons know that he really enjoys his new job as Sarge's right-hand man. Simmons then declares that he will kill all the Reds and tells Sheila to "lock and load".

Back at Zanzibar, Tex talks with Andy. Tex, through some bluffing and mild threats of blowing up Andy with a remote detonator, convinces him to help her translate what the alien is saying. This, however, doesn't stop Andy from making rude jokes about Tex acting more male than female.