Nerf Ghostbusters is the Halloween episode that was made in 2012 and is separated into 2 parts.
While on his computer checking his e-mail; Danny finds a strange e-mail that reads "Do NOT Click Here - Bad Things Happen". Danny doesn't click anything; however when he shows his brother, Tommy starts getting curious and when Danny gets up off his computer. Tommy takes control and then clicks the button. Afterwards; Danny is in the house and Tommy is outside. Danny goes about his buisness when low and behold; the viewers see ghosts in the house. At the end of part one; Danny finally gets a glimpse of what's plaguing the house.
After the events of part 1; Danny notifies Tommy that there are in fact ghosts within the confines of the house. They then prepare themselves for the worse by getting their Nerf Guns. Both Tommy and Danny pack the Nerf Maverick; then take out multiple ghosts. They soon get to the kitchen where they see that the ghosts are coming from the opened link on Danny's laptop. Danny covers him while Tommy takes the laptop; takes it outside, chucks it and destroys it. After eradicating the ghosts; Danny and Tommy end it off by shooting at each other.