Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode title | Villain(s) | Identity(ies) | Reason(s) | Original airdate | DVD volume |
| --- | --- | --- | --- | --- | --- |
| "Curse of the Collar" | The Ghost of Buster Mc mauler Mutt | Mr. Trixenstuff | To steal Scooby's new collar for the jewels. | September 9, 1989 | 4.0 |
| "The Return of Commander Cool" | The Alien Slug | Barbara Simone | To steal and sell Commander Cool toy blueprints. | September 16, 1989 | 4.0 |
| "The Spirit of Rock and Roll" | The Ghost of Purvis Parker | Mr. Dilton | To ruin Buddy Chillner. | September 23, 1989 | 4.0 |
| "Chickenstein Lives!" | Chickenstein | Casmer Codwaller (Granny Sweetwater) | To sell stolen merchandise. | September 30, 1989 | 5.0 |
| "Night of the Living Burger" | The Burger Monster | Skippy Johnson | He wanted a raise from his employer. | October 14, 1989 | 5.0 |
| "The Computer Walks Among Us" | The Computer Monster | Bruce Wormsley | He wanted to be the smartest kid in school. | October 21, 1989 | 5.0 |
| "Dog Gone Scooby" | The Mad Scientist | Paula P. Casso (Due to a misunderstanding) | To make a painting of Scooby's head. | October 28, 1989 | 5.0 |
| "Terror, Thy Name is Zombo" | Zombo The Phantom Clown | Joey Jipner | To run the amusement park by himself. | November 4, 1989 | 6.0 |
Question:
How many DVD volumes was identified by Skippy Johnson?
Answer:
5.0