Redneck Will was right, and the alien with the tunic is the evil one. Holly stumbles on a transmission by another alien, the one in the clip before, who has died while tracking this criminal alien across the universe. The evil alien wants Marshall's machine so he can travel back in time and plant his soldiers in the past to control earth's future.
Disguised in alien suits, Rick and Will try to rescue Holly and manage to get into a fight with the good and evil aliens. The T-Rex also makes an appearance - Rick has an idea to bravely pole-vault towards it, like his inspirational poster, but is quickly eaten.
Soon the T-Rex is back on the scene killing off the bad guys - ridden by Dr Marshall, and they retrieve the tachyon amplifier. He explains that while inside he helped dislodge some stuff, and the T Rex was thankful.
They open a portal to go home, but Will and Chaka need to keep the evil alien back while the door is closing. Rick and Holly travel through the portal while Will bravely stays behind - but as he approaches Chaka's village he discovers that the "ugly" women Chaka talked about are in fact beautifully tanned ladies who swarm around him.
Back in the tv studio, Rick has a stab at a second interview with the talk show host to promote his new book, resulting in a second fight when the presenter is contractually obliged to read the title of the book. They cut this time with the presenter trying to get his hands around Marshall's throat.
After the credits, the egg that Holly brought back is left in the TV studio, and under the warm glare of the lights it starts to hatch ... and out pops one of the (evil) baby aliens!