Big Guy and Rusty the Boy Robot Season 1 Episode 4 Birthday Bash Episode Title:Birthday Bash.Episode Description:After Quark Ind. retrieves an alien item, two alien mercenaries hunt for it. As Hunter preps for a day off, his team give him a transponder to remote summon Big Guy; Rusty learns about "birthdays" with real children, and comes across the alien device taking it as a "gift"; Hunter arrives for his nephew Jeffy's birthday, surprised Rusty followed him. Slate finds two scientists merged by the alien device into a single entity with all body parts of both; she sees the two aliens in the lab & realizes Rusty took the device, and calls Hunter to warn him. The device activates, trapping Hunter's sister in a wall, with the aliens tracking it to her house. Rusty keeps it away by throwing it to Big Guy, and Rusty prevents the house from being destroyed. The aliens get the device, but Big Guy thinks quick & shoots it to activate it and fused the aliens. Using the device, Hunter's sister is freed from the wall, who allows Big Guy & Rusty to stay for cake to celebrate Jeffy's birthday.